Indoor Air Quality (IAQ) deals with the content of interior air that could affect health and comfort of building occupants. Pollution is the introduction of contaminants into an environment that causes instability disorder harm or discomfort to the physical systems or living organisms they are in Air pollution is the human introduction into the atmosphere of Chemicals Particulate matter, or Biological materials that cause harm or discomfort Acid rain is Rain or any other form of precipitation that is unusually Acidic It has harmful effects on plants aquatic animals and infastructure The Air Quality Index ( AQI) is a standardized indicator of the Air Quality in a given location Atmospheric dispersion modeling is the mathematical simulation of how air pollutants disperse in the ambient atmosphere. The haloalkanes (also known as halogenoalkanes or alkyl halides) are a group of Chemical compounds consisting of Alkanes such as Methane Global dimming is the gradual reduction in the amount of global direct Irradiance at the Earth 's surface that was observed for several decades after the start of systematic Global warming is the increase in the average measured temperature of the Haze is traditionally an atmospheric phenomenon where dust smoke and other dry particles obscure the clarity of the sky Ozone depletion describes two distinct but related observations a slow steady decline of about 4 percent per decade in the total amount of Ozone in Earth's Particulates, alternatively referred to as particulate matter (PM or fine particles, are tiny particles of solid or liquid suspended in a gas Smog is a kind of Air pollution; the word "smog" is a Portmanteau of Smoke and Fog. Water pollution is the contamination of Water bodies such as Lakes Rivers Oceans and Groundwater caused by human activities Eutrophication is an increase in chemical Nutrients -- typically compounds containing Nitrogen or Phosphorus -- in an Ecosystem, and may occur For other uses of the term "hypoxia" see Hypoxia. Hypoxia or oxygen depletion is a phenomenon that occurs in aquatic environments Marine pollution is the harmful effect caused by the entry into the ocean of chemicals particles, or Plastic debris. For the fictional character see Oil Slick (Transformers. An oil spill is the release of a Liquid Petroleum Hydrocarbon into Ship pollution is the pollution of air and Water by Shipping. Surface runoff is a term used to describe when soil is infiltrated to full capacity and excess Water, from Rain, Snowmelt, or other sources flows Thermal pollution is a Temperature change in natural bodies of water caused by human influence Distinguish from Wastwater (a lake in the Lake District in northwest England Waterborne diseases are caused by Pathogenic Microorganisms which are directly transmitted when contaminated Drinking water is consumed Water quality is the physical chemical and biological characteristics of Water in relationship to a set of standards Water stagnation occurs when Water stops flowing Stagnant water can be a major Environmental hazard. Soil contamination is caused by the presence of man-made chemicals or other alteration in the natural soil environment Bioremediation can be defined as any process that uses Microorganisms Fungi, green plants or their Enzymes to return the natural environment altered A herbicide is used to kill unwanted Plants Selective herbicides kill specific targets while leaving the desired Crop relatively unharmed A pesticide is a substance or mixture of substances used to kill a pest. Radioactive contamination is the uncontrolled distribution of radioactive material in a given environment Actinides in the environment refer to the sources environmental behaviour and effects of Actinides in the environment. Environmental Radioactivity is the study of radioactive materials in the Human environment. Fission products are the atomic fragments left after a large nucleus fissions. Fallout is the residual radiation hazard from a Nuclear explosion, so named because it "falls out" of the atmosphere into which it is spread during the explosion Plutonium in the environment is an article which is part of the Actinides in the environment series Radiation poisoning, also called " radiation sickness " or a " creeping dose " is a form of damage to organ tissue due to excessive exposure to This is a subpage of Environmental radioactivity. Radium Radium in quack medicine See the story of Eben Byers for details of one very nasty case Uranium in the environment, this page is about the Science of Uranium in the environment and in animals (including humans Introduced species|Weed Invasive species is a phrase with several definitions Light pollution, also known as photopollution or luminous pollution, is excess or obtrusive Light created mainly by Humans Among other effects Noise pollution (or environmental noise) is displeasing human- or machine-created sound that disrupts the activity or balance of human or animal life Radio spectrum pollution is the straying of waves in the radio and Electromagnetic spectrums outside their allocations that cause problems for some activities Visual pollution is the term given to unattractive or unnatural (human-made visual elements of a vista a Landscape, or any other thing that a person might not want to For other similarly-named agreements see Montreal Convention (disambiguation. Protocol to the 1979 Convention on Long-Range Transboundary Air Pollution Concerning the Control of Emissions of Nitrogen Oxides or Their Transboundary Fluxes, opened for signature on The Kyoto Protocol is a protocol to the international Framework Convention on Climate Change with the objective of reducing Greenhouse gases in an effort The Convention on Long-Range Transboundary Air Pollution, often abbreviated as Air Pollution or CLRTAP, is intended to protect the human environment against Air This is a list of environmental organizations. See also Environmental organization Intergovernmental organizations International organizations The Department for Environment Food and Rural Affairs ( Defra) is the United Kingdom government department responsible for environmental protection The Global Atmosphere Watch (GAW is a worldwide system established by the World Meteorological Organization a United Nations agency to monitor trends in the Greenpeace, originally known as the Greenpeace Foundation, was founded in Vancouver, British Columbia, Canada in 1972 The National Ambient Air Quality Standards (NAAQS are standards established by the United States Environmental Protection Agency that apply for outdoor Air Environmental science is the study of interactions among physical chemical and biological components of the environment. See also Nature The natural environment, commonly referred to simply as the environment, is a terminology that is comprised of all living and The IAQ may be compromised by microbial contaminants (mold, bacteria), chemicals (such as carbon monoxide, radon), allergens, or any mass or energy stressor that can induce health effects. WikipediaManual_of_Style#National_varieties_of_English --> Molds (or The Bacteria ( singular: bacterium) are a large group of unicellular Microorganisms Typically a few Micrometres in length bacteria have Carbon monoxide, with the chemical formula CO is a colorless odorless tasteless yet highly toxic Gas. Radon (ˈreɪdɒn is the Chemical element that has the symbol Rn and Atomic number 86 An allergen is a nonparasitic Antigen capable of stimulating a Type-I hypersensitivity reaction in atopic individuals Recent findings have demonstrated that indoor air is often more polluted than outdoor air (albeit with different pollutants) although this has not changed the common understanding of air pollution. Air pollution is the human introduction into the atmosphere of Chemicals Particulate matter, or Biological materials that cause harm or discomfort In fact, indoor air is often a greater health hazard than the corresponding outdoor setting. Using ventilation to dilute contaminants, filtration, and source control are the primary methods for improving indoor air quality in most buildings. Ventilation is the intentional movement of Air from outside a building to the inside
Techniques for analyzing IAQ include collection of air samples, collection of samples on building surfaces and computer modelling of air flow inside buildings. The resulting samples can be analyzed for mold, bacteria, chemicals or other stressors. These investigations can lead to an understanding of the sources of the contaminants and ultimately to strategies for removing the unwanted elements from the air.
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Common pollutants
Radon
Radon is an invisible, radioactive atomic gas that results from radioactive decay of some forms of uranium that may be found in rock formations beneath buildings or in certain building materials themselves. Radon (ˈreɪdɒn is the Chemical element that has the symbol Rn and Atomic number 86 Uranium (jʊˈreɪniəm is a silvery-gray Metallic Chemical element in the Radon is probably the most pervasive serious hazard for indoor air in the United States and Europe, probably responsible for tens of thousands of deaths from lung cancer each year U.S. EPA Indoor Environment Division, Radon. There are relatively simple tests for radon gas, but these tests are not commonly done, even in areas of known systematic hazards. Radon is a heavy gas and thus will tend to accumulate at the floor level. Building materials can actually be a significant source of radon, but very little testing is done for stone, rock or tile products brought into building sites. The half life for radon is 3. 8 days, indicating that once the source is removed, the hazard will be greatly reduced within a few weeks. However annually thousands of people go to Radon contaminated mines for purposeful exposure to help with the symptoms of arthritis without any serious known health effects.
Molds and other allergens
These biological chemicals can arise from a host of means, but there are two common classes: (a) moisture induced growth of mold colonies and (b) natural substances released into the air such as animal dander and plant pollen. Molds are ubiquitous in nature and mold Spores are a common component of household and workplace dust This article is about Mold growth in buildings how to kill mold and the more formal topics of assessment and remediation Moisture buildup inside buildings may arise from water penetrating compromised areas of the building envelope or skin, from plumbing leaks, from condensation due to improper ventilation, or from ground moisture penetrating a building part. Condensation is the change of the physical state of aggregation (or simply state of matter from gaseous phase into liquid phase In areas where cellulosic materials (paper and wood, including drywall) become moist and fail to dry within 48 hours, mold mildew can propagate and release allergenic spores into the air.
In many cases, if materials have failed to dry out several days after the suspected water event, mold growth is suspected within wall cavities even if it is not immediately visible. Through a mold investigation, which may include destructive inspection, one should be able to determine the presence or absence of mold. In a situation where there is visible mold and the indoor air quality may have been compromised, mold remediation may be needed. This article is about Mold growth in buildings how to kill mold and the more formal topics of assessment and remediation Mold Testing and Inspections should be done by an independent investigator to avoid any conflict of interest and to insure accurate results. Beware of free mold testing, Mold Testers and Inspectors should have no relation to any remediation companies.
There are some varieties of mold that contain toxic compounds (mycotoxins). However, exposure to hazardous levels of mycotoxin via inhalation is not possible in most cases, as toxins are produced by the fungal body and are not at significant levels in the released spores. The primary hazard of mold growth, as it relates to indoor air quality, comes from the allergenic properties of the spore cell wall. More serious than most allergenic properties is the ability of mold to trigger episodes in persons that already have asthma, a serious respiratory disease.
Indoors, mold growth can be inhibited by keeping humidity levels below 50% and by eliminating any water leaks. Moisture problems causing mold growth can be direct such as a water leaks and/or indirect such as condensation due to humidity levels.
Mold is always associated with moisture, in order to resolve a mold problem moisture problems must be reduced. Guidance is available from the World Health Organization in their publication “Development of WHO guidelines for indoor air quality: dampness and mould. Report on a working group meeting, 17-18 October 2007” on the web under http://www.euro.who.int/Document/E91146.pdf.
Carbon monoxide
One of the most acutely toxic indoor air contaminants is carbon monoxide (CO), a colorless, odorless gas that is a byproduct of incomplete combustion of fossil fuels. Carbon monoxide, with the chemical formula CO is a colorless odorless tasteless yet highly toxic Gas. Common sources of carbon monoxide are tobacco smoke, space heaters using fossil fuels, defective central heating furnaces and automobile exhaust. Fossil fuels or mineral fuels are fossil source Fuels that is Hydrocarbons found within the top layer of the Earth’s crust. Improvements in indoor levels of CO are systematically improving from increasing numbers of smoke-free restaurants and other legislated non-smoking buildings. A smoke-free restaurant is a dining establishment which does not allow smoking, either voluntarily or because of a legal Smoking ban. By depriving the brain of oxygen, high levels of carbon monoxide can lead to nausea, unconsciousness and death. According to ACGIH (American Conference of Governmental Industrial Hygienist), TWA (Time Waited Average) limit for CO (630-08-0) is 25 ppm.
Volatile Organic Compounds
Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids. VOCs include a variety of chemicals, some of which may have short- and long-term adverse health effects. Concentrations of many VOCs are consistently higher indoors (up to ten times higher) than outdoors. VOCs are emitted by a wide array of products numbering in the thousands. Examples include: paints and lacquers, paint strippers, cleaning supplies, pesticides, building materials and furnishings, office equipment such as copiers and printers, correction fluids and carbonless copy paper, graphics and craft materials including glues and adhesives, permanent markers, and photographic solutions U.S. EPA IAQ - Organic chemicals.
Organic chemicals are widely used as ingredients in household products. Paints, varnishes, and wax all contain organic solvents, as do many cleaning, disinfecting, cosmetic, degreasing, and hobby products. Fuels are made up of organic chemicals. All of these products can release organic compounds while you are using them, and, to some degree, when they are stored.
Studies of VOCs in large buildings and in residences over the past two decades have shown that their concentrations have decreased considerably, probably as a result primarily of regulations limiting emissions of precursors of photochemical smog but also due to heightened awareness of their importance indoors to occupant health VOC Concentrations of Interest in North American Offices and Homes. Testing emissions from building materials used indoors has become increasingly common for floor coverings, paints, and many other important indoor building materials and finishes. Many useful links are available on-line such as California IAQ Information: Volatile Organic Compounds.
Legionella
Legionellosis or Legionnaire's Disease is caused by a waterborne bacterium that grows best in slow moving or still warm water. Legionellosis is an Infectious disease caused by Bacteria belonging to the Genus Legionella. The Bacteria ( singular: bacterium) are a large group of unicellular Microorganisms Typically a few Micrometres in length bacteria have The primary route of exposure is aerosolization, most commonly from evaporative cooling towers or showerheads. A common source of Legionella in commercial buildings is from poorly placed or maintained evaporative cooling towers, which often release aerosolized water that may enter nearby ventilation intakes. Outbreaks in medical facilities and nursing homes, where patients are immuno-suppressed and immuno-weak, are the most commonly reported cases of Legionellosis. More than one case has involved outdoor fountains in public attractions. The presence of Legionella in commercial building water supplies is highly under-reported, as healthy people require heavy exposure to acquire infection.
Legionella testing typically involves collecting water samples and surface swabs from evaporative cooling basins, shower heads, faucets, and other locations where warm water collects. The samples are then cultured and colony forming units (cfu) of Legionella are quantified as cfu/Liter.
Legionella is a parasite of protazoans such as amoeba, and thus requires conditions suitable for both organisms. Amoeba (sometimes amœba or ameba, plural amoebae) is a Genus of Protozoa that moves The bacterium forms a biofilm which is resistant to chemical and antimicrobial treatments, including chlorine. A biofilm is a structured community of Microorganisms encapsulated within a self-developed polymeric matrix and adherent to a living or inert surface Remediation for Legionella outbreaks in commercial buildings vary, but often include very hot water flushes (160°F), sterilization of standing water in evaporative cooling basins, replacement of shower heads, and in some cases flushes of heavy metal salts. Preventative measures include adjusting normal hot water levels to allow for 120°F at the tap, evaluating facility design layout, removing faucet aerators, and periodic testing in suspect areas.
Asbestos fibers
The U. S. Federal Government (www. osha. gov) and some States have set standards for acceptable levels of asbestos fibers in indoor air. Asbestos is a group of Minerals with long thin fibrous Crystals The word "asbestos" (῾ἀσβεστος is derived from a Greek adjective Many common building materials used before 1975 contain asbestos, such as some floor tiles, ceiling tiles, taping muds, pipe wrap, mastics and other insulation materials. Normally significant releases of asbestos fiber do not occur unless the building materials are disturbed, such as by cutting, sanding, drilling or building remodelling. There are particularly stringent regulations applicable to schools. Inhalation of asbestos fibers over long exposure times is associated with increased incidence of lung cancer. Lung cancer is a Disease of uncontrolled Cell growth in tissues of the Lung. While smokers have a greater risk of lung cancer than asbestos workers that do not smoke, smokers that are exposed to high levels of asbestos over many years have a much greater risk of developing lung cancer than either smokers that have not been exposed to asbestos, or persons that have been exposed to high levels of asbestos that do not smoke.
Asbestos is found in older homes and buildings, but it is most dangerous in schools and industrial settings. It was once widely used in shingles, fireproofing, heating systems and floor and ceiling tiles in older buildings. When asbestos-containing material is damaged or disintegrates, microscopic fibers are dispersed into the air. The risk of lung cancer from inhaling asbestos fibers is also greater to smokers. While most asbestos-associated cancers are related to the intensity and duration of exposure, the symptoms of the disease do not usually appear until about 20 to 30 years after the first exposure to asbestos. Removal of asbestos-containing materials is not always wise because the fibers can be released into the air during the removal process. The EPA requires removal only in order to prevent significant exposure. A management program for intact asbestos-containing materials is often recommended instead.
Carbon dioxide
Carbon dioxide (CO2)is a surrogate for indoor pollutants emitted by humans and correlates with human metabolic activity. Carbon dioxide ( Chemical formula:) is a Chemical compound composed of two Oxygen Atoms covalently bonded to a single Carbon dioxide at levels that are unusually high indoors may cause occupants to grow drowsy, get headaches, or function at lower activity levels. Humans are the main indoor source of carbon dioxide. Indoor levels are an indicator of the adequacy of outdoor air ventilation relative to indoor occupant density and metabolic activity. To eliminate most Indoor Air Quality complaints, total indoor carbon dioxide should be reduced to below 600 ppm above outdoor levels. Indoor Air Quality (IAQ deals with the content of interior air that could affect health and comfort of building occupants NIOSH considers that indoor air concentrations of carbon dioxide that exceed 1,000 ppm are a marker suggesting inadequate ventilation. The National Institute for Occupational Safety and Health (or NIOSH) is the United States federal agency responsible for conducting research and making recommendations "Parts-per" notation is used especially in Science and Engineering, to denote Ratios (relative proportions in measured quantities particularly ASHRAE recommends that carbon dioxide levels not exceed 700 ppm above outdoor ambient levels. The American Society of Heating Refrigerating and Air Conditioning Engineers ( ASHRAE; pronounced 'ash'-'ray' is an international technical society for all individuals The UK standards for schools say that carbon dioxide in all teaching and learning spaces, when measured at seated head height and averaged over the whole day should not exceed 1,500 ppm. The whole day refers to normal school hours (i. e. 9. 00am to 3. 30pm) and includes unoccupied periods such as lunch breaks. Canadian standards limit carbon dioxide to 3500 ppm. OSHA limits carbon dioxide concentration in the workplace to 5,000 ppm for prolonged periods, and 35,000 ppm for 15 minutes. For the European Agency see European Agency for Safety and Health at Work, (OSHA
Ozone
Ozone is produced by ultraviolet light from the Sun hitting the Earth's atmosphere (especially in the ozone layer), lightning, certain electric devices (such as air ionisers), and as a byproduct of other types of pollution. OZONE is an object oriented Operating system written in the C programming language. The photochemical mechanisms that give rise to the ozone layer were worked out by the British physicist Sidney Chapman in 1930 An air ioniser is a device that uses High voltage to Ionise (electrically charge air Molecules Negative ions or Anions, are particles with
Ozone exists in greater concentrations at altitudes commonly flown by passenger jets. Reactions between ozone and onboard substances, including skin oils and cosmetics, can product toxic chemicals as byproducts. Ozone itself is also irritating to lung tissue and harmful to human health. Larger jets have ozone filters to reduce the cabin concentration to safer and more comfortable levels. [1]
Outdoor air used for ventilation may have sufficient ozone to react with common indoor pollutants as well as skin oils and other common indoor air chemicals or surfaces. Particular concern is warranted when using "green" cleaning products based on citrus or terpene extracts as these chemicals react very quickly with ozone to form toxic and irritating chemicals as well as fine and ultrafine particles. Particulates, alternatively referred to as particulate matter (PM or fine particles, are tiny particles of solid or liquid suspended in a gas Ultrafine particles ( UFPs) are Nanoscale, less than 100 Nanometres Clusters of UFPs can be seen with the naked eye The effects of ventilation with outdoor containing elevated ozone concentrations is reported by Apte et al in a report available from Lawrence Berkeley Laboratory's web site, [2].
Developing countries
A major source of indoor air pollution in developing countries is the burning of biomass (e. Indoor air pollution in developing nations is a significant form of indoor air pollution (IAP that is little known to those in the Developed world. Biomass refers to living and recently dead Biological material that can be used as fuel or for industrial production g. wood, charcoal, dung, or crop residue) for heating and cooking. The resulting exposure to high levels of particulate matter resulted in between 1. Particulates, alternatively referred to as particulate matter (PM or fine particles, are tiny particles of solid or liquid suspended in a gas 5 and 2 million deaths in 2000. [3]
HVAC design
The "green design" movement in the commercial and residential HVAC industry emphasizes paying attention to the issue of indoor air quality throughout the design and construction stages of a building's life.
One technique to reduce energy consumption while maintaining adequate air quality, is demand controlled ventilation. Instead of setting throughput at a fixed air replacement rate, carbon dioxide sensors are used to control the rate dynamically, based on the emissions of actual building occupants.
For the past several years, there have been many debates among indoor air quality specialists about the proper definition of indoor air quality and specifically what constitutes "acceptable" indoor air quality.
One way of quantitatively ensuring the health of indoor air is by the frequency of effective turnover of interior air by replacement with outside air. In the UK, for example, classrooms are required to have 2. 5 outdoor air changes per hour. In halls, gym, dining, and physiotherapy spaces, the ventilation should be sufficient to limit carbon dioxide to 1,500 ppm. Ventilation is the intentional movement of Air from outside a building to the inside Carbon dioxide ( Chemical formula:) is a Chemical compound composed of two Oxygen Atoms covalently bonded to a single In the USA, and according to ASHRAE Standards, ventilation in classrooms is based on the amount of outdoor air per occupant, not air changes per hour. Since carbon dioxide indoors comes from occupants and outdoor air, the adequacy of ventilation per occupant is indicated by the concentration indoors minus the concentration outdoors. The value of 650 ppm above the outdoor concentration indicates approximately 15 cubic feet per minute of outdoor air per adult occupant doing sedentary office work. In classrooms, the requirements in the ASHRAE standard 62. 1, Ventilation for Acceptable Indoor Air Quality, would typically result in about 3 air changes per hour, depending on the occupant density. Of course the occupants aren't the only source of pollutants, so outdoor air ventilation may need to be higher when unusual or strong sources of pollution exist indoors.
The use of air filters can trap some of the air pollutants. An air filter is a device which removes solid Particulates such as Dust, Pollen, Mold, and bacteria from Air. The Department of Energy's Energy Efficiency and Renewable Energy section wrote "[Air] Filtration should have a Minimum Efficiency Reporting Value (MERV) of 13 as determined by ASHRAE 52. 2-1999. "[4] Air filters are used to reduce the amount of dust that reaches the wet coils. Dust can serve as food to grow molds on the wet coils and ducts and can reduce the efficiency of the coils.
Moisture management and humidity control requires operating HVAC systems as designed. Moisture management and humidity control may conflict with efforts to try to optimize the operation to conserve energy. For example, Moisture management and humidity control requires systems to be set to supply Make Up Air at lower temperatures (design levels), instead of the higher temperatures sometimes used to conserve energy in cooling-dominated climate conditions. However, for most of the US and many parts of Europe and Japan, during the majority of hours of the year, outdoor air temperatures are cool enough that the air does not need further cooling to provide thermal comfort indoors. However, high humidity outdoors creates the need for careful attention to humidity levels indoors. High humidities give rise to mold growth and moisture indoors is associated with a higher prevalence of occupant respiratory problems.
The "dew point temperature" is an absolute measure of the moisture in air. Some facilities are being designed with the design dew points in the lower 50's °F, and some in the upper and lower 40's °F. Some facilities are being designed using desiccant wheels with gas fired heater to dry out the wheel enough to get the required dew points. On those systems, after the moisture is removed from the make up air, a cooling coil is used to lower the temperature to the desired level.
Commercial buildings, and sometimes residential, are often kept under slightly-positive air pressure relative to the outdoors to reduce infiltration. Infiltration is the unintentional or accidential introduction of outside air into a building typically through cracks in the building envelope and through use of doors for passage Limiting infiltration helps with moisture management and humidity control.
Dilution of indoor pollutants with outdoor air is effective to the extent that outdoor air is free of harmful pollutants. Ozone in outdoor air occurs indoors at reduced concentrations because ozone is highly reactive with many chemicals found indoors. The products of the reactions between ozone and many common indoor pollutants include organic compounds that may be more odorous, irritating, or toxic than those from which they are formed. These products of ozone chemistry include formaldehyde, higher molecular weight aldehydes, acidic aerosols, and fine and ultrafine particles, among others. The higher the outdoor ventilation rate, the higher the indoor ozone concentration and the more likely the reactions will occur, but even at low levels, the reactions will take place. This suggests that ozone should be removed from ventilation air, especially in areas where outdoor ozone levels are frequently high. Recent research has shown that mortality and morbidity increase in the general population during periods of higher outdoor ozone and that the threshold for this effect is around 20 parts per billion (ppb).
Institutional programs
The topic of IAQ has become popular due to the greater awareness of health problems caused by mold and triggers to asthma and allergies. Asthma is a chronic Condition involving the Respiratory system in which the airways occasionally constrict become inflamed, and are Allergy is a disorder of the Immune system often also referred to as Atopy. Awareness has also been increased by the involvement of the United States Environmental Protection Agency. They have developed an "IAQ Tools for Schools" program to help improve the indoor environmental conditions in educational institutions (see external link below).
The National Institute for Occupational Safety and Health conducts Health Hazard Evaluations (HHEs) in workplaces at the request of employees, authorized representative of employees, or employers, to determine whether any substance normally found in the place of employment has potentially toxic effects. The National Institute for Occupational Safety and Health (or NIOSH) is the United States federal agency responsible for conducting research and making recommendations Several HHE reports relate to indoor air quality. NIOSH also offers many tools for building owners and managers dealing with indoor air issues.
A variety of scientists work in the field of indoor air quality including chemists, physicists, mechanical engineers, biologists, bacteriologists and computer scientists. Some of these professionals are certified by organizations such as the American Industrial Hygiene Association and the American Indoor Air Quality Council. AIHA and A2LA both offer laboratory accreditation programs that relate to indoor air quality.
On the international level, the International Society of Indoor Air Quality and Climate (ISIAQ), formed in 1991, organizes two major conferences, the Indoor Air and the Healthy Buildings series. The next conference, Indoor Air 2008, will take place in Copenhagen, Denmark. Healthy Buildings 2009 will be held in Syracuse, New York. ISIAQ's journal Indoor Air is published 6 times a year and contains peer-reviewed scientific papers with an emphasis on interdisciplinary studies including exposure measurements, modeling, and health outcomes.
How To Improve Indoor Air Quality
According to the National Safety Council, Americans spend about 90 percent of their time indoors, and 65 percent of that time at home. Thus poor indoor air quality can have a significant impact on people’s lives, especially those who are most vulnerable: infants and children, pregnant women, the elderly, and those who have chronic illnesses.
Steps can be taken to help improve indoor air quality at home, the workplace, and in other indoor environments. Some of those steps include the following:
- Understand the role of Green Cleaning. Green cleaning isa term that has been coined to describe a growing trend in favor of using Environmentally-friendly ingredients and chemicals for household manufacturing and Many "green" cleaning products contain chemicals that react with ozone to form toxic and irritating chemicals, as described above, through indoor air chemical reactions. The result is air that may contain more hazardous chemicals than were present before the green cleaning products were used. In particular, citrus based solvents and pine-based solvents have been shown to react with ozone and form formaldehyde, higher molecular weight aldehydes, acidic aerosols, and fine and ultrafine particles. Ozone can be removed from outdoor air by filtration with carbon, but large amounts of carbon are required to remove a high fraction of the ozone present in most urban and many ex-urban areas.
- Install an air purifier, or an air purification system. Caution is advised. Ozone-based air cleaners are not advised and both the U. S. EPA and the California Air Resources Board have issued advisories on the use of ozone air cleaners. California is currently proposing to regulate ozone air cleaners.
- Introducing plants to reduce the levels of indoor air pollution is only minimally effective. Many advocates of plants have advised introducing "toxin-consuming plants" to your home, office, and other indoor environments. Certain plants, including philodendron, spider plants, golden pothos, peace lilies, bamboo palms, mums, and english ivy remove dangerous toxins (e. Philodendron is a large genus of Flowering plants from the arum family ( Araceae) consisting of close to 900 or more species according to TROPICOS (a The Spider Plant, Chlorophytum comosum, is a species of Chlorophytum native to South Africa. Spathiphyllum is a genus of about 40 species of Monocotyledonous Flowering plants in the family Araceae, native to tropical regions of the Chrysanthemums, often called 'mums' are a genus ( Chrysanthemum) of about 30 species of perennial Flowering plants in the family Asteraceae Hedera helix (species name from Ancient Greek "twist turn" also called Ivy, Common Ivy, or English Ivy is a species g. , formaldehyde, carbon monoxide, benzene, and others) from the air, but at extremely low rates. Even minimal ventilation with outdoor air removes them more quickly. In fact, the plants themselves do not play a major role in the removal of pollutants whereas the soil or other medium in which they are planted have been shown to play the removal role. The amount of pollutants removed by plants is actually minuscule compared to the removal that occurs even with very low rates of outdoor air ventilation. There is also a risk of increasing indoor humidity levels and of promoting mold growth when indoor plants are not properly maintained. A better understanding the impact of plants is presented in the article "Can House Plants Solve Indoor Air Quality Problems."
- Use natural household cleaning products and reduce exposure to potentially toxic airborne substances. Be wary of so-called "green" cleaning products if outdoor ozone concentrations are above 50 ppb.
- Use natural pest control techniques indoors whenever possible. Banish pesticides from your garden and lawn as well, as these toxins can easily be transported into the house on shoes and clothing and by air.
- Keep your plumbing traps filled with water to help prevent sewer gas from entering the building. Sewer gas is a mixture of gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes
- Regularly clean the vents in your kitchen, bathroom, and dryer, and make sure they operate properly.
- Do not smoke or allow smoking in your home, and avoid indoor areas where smoking takes place.
- Avoid or reduce biological contaminants by maintaining humidifiers, dehumidifiers, and air conditioners; emptying water trays in dehumidifiers, air conditioners, and refrigerators frequently; drying or removing any water-damaged carpets or furniture; and routinely cleaning bedding and items used by pets.
- Prevent carbon monoxide exposure by keeping gas appliances properly serviced, having your central heating system inspected and cleaned yearly, and never idling your car inside an attached garage. Install an automatic door closer on the door connecting the garage to the house.
- Change filters on central cooling and heating systems and air cleaners according to the manufacturer’s directions.
- Test your home for radon. Radon can seep into the house from contaminated earth and rock under the home, or from well water and/or building materials. Easy, do-it-yourself kits can be purchased at hardware and other retail outlets.
- Ensure good ventilation.
- Have any air-contioning systems inspected regularly to verify that there is no internal contamination build up contributing to poor indoor air quality.
- Keep crawl spaces, basements, and soil immediately around the house clean and dry.
- Use Clean-Off-Zones to collect the fine dust in the entrance.
References
- ^ Study: Bad In-Flight Air Exacerbated by Passengers Talk of the Nation, National Public Radio. September 21, 2007.
- ^ Outdoor ozone and building related symptoms in the BASE study
- ^ Ezzati, M. , and D. M. Kammen. 2002. "The health impacts of exposure to indoor air pollution from solid fuels in developing countries: knowledge, gaps, and data needs. " Environmental Health Perspectives 110. 11 (Nov 2002): 1057(12). 27 April 2007.
- ^ [1] DOE EERE Indoor Air Quality - MERV 13 Air Filters
- Salthammer, T. (ed. )1999. "Organic Indoor Air Pollutants — Occurrence, Measurement, Evaluation". Wiley-VCH, Germany.
- Spengler, J. D. and Samet, J. M. (1991). "Indoor air pollution: A health perspective". Johns Hopkins University Press, Baltimore.
- Spengler, J. D. , Samet, J. M. & McCarthy, J. F (2001). "Indoor Air Quality Handbook". McGraw–Hill, NY. ISBN 0-07-445549-4.
- http://www.epa.gov/ebtpages/airindoorairpollution.html - Website of the United States Environmental Protection Agency (US EPA)
- Study: Bad In-Flight Air Exacerbated by Passengers Talk of the Nation, National Public Radio. September 21, 2007.
- Outdoor ozone and building related symptoms in the BASE study
- Ezzati, M. , and D. M. Kammen. 2002. "The health impacts of exposure to indoor air pollution from solid fuels in developing countries: knowledge, gaps, and data needs. " Environmental Health Perspectives 110. 11 (Nov 2002): 1057(12). 27 April 2007.
- DOE EERE Indoor Air Quality - MERV 13 Air Filters
- http://buildingecology.com/ "Can house plants solve indoor air problems?"
See also
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External links
- US Environmental Protection Agency info on IAQ
- Indoor Air Quality Association
- American Indoor Air Quality Council
- American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)
- American Board of Industrial Hygiene
- Institute of Inspection, Cleaning and Restoration Certification
- National Safety Council
- Government of Hong Kong Occupational Safety and Health Council, Air Contaminants in the Workplace
- US EPA Ozone Generator Information
- US EPA Residential Air Cleaner Information
- US EPA Mold Remediation in Schools and Commercial Buildings
- Asthma and Air Pollution. A guide for health professionals. National Asthma Council. Australia
- National Institute for Occupational Safety and Health - Indoor Environmental Quality
- Building Ecology web site
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