Meghan Hodges
Indoor air pollution is a serious threat to human health, causing millions of deaths each year. The air within homes and other buildings can be more polluted than the outdoor air in industrialized cities, and people spend approximately 90% of their time indoors. Indoor air quality (IAQ) is affected by pollutants that penetrate from the outdoors, as well as sources that are unique to the indoor environment, such as building materials, household cleaners, and biological pollutants like dust mites and pet dander. While the specific top indoor pollutant is hard to determine, the cumulative effects of these sources can have serious health impacts, including respiratory diseases, heart disease, cognitive deficits, and cancer.
| Characteristics | Values |
|---|---|
| Top indoor pollutant | Carbon monoxide (CO) |
| Sources | Tobacco smoke, gas stoves and pilot lights, wood stoves and fireplaces, gas- and kerosene-fueled space heaters, gasoline engines, camping lanterns and stoves, attached garages and street-level intake vents |
| Health effects | Headaches, fatigue, queasiness, brain and heart damage, death |
| Baseline levels | Determined by the endogenous production of the gas by the catabolism of hemoglobin and other heme-containing compounds, as well as the intake of low ambient CO levels |
| Other indoor pollutants | Radon, particle pollution, Legionella bacterium, dust mites, mold, pet dander, environmental tobacco smoke, cockroach allergens, volatile organic compounds, formaldehyde, combustion byproducts, nitrogen dioxide (NO2) |
| Factors affecting indoor pollution | Air exchange rate, outdoor climate, weather conditions, occupant behavior, energy-efficient building construction, use of synthetic building materials and household products |
| Health effects of indoor pollution | "Sick building syndrome", increased risk for vulnerable groups (young, old, people with cardiovascular or respiratory disease), triggering asthma attacks, reduced lung function growth in children, premature mortality, increased hospital admissions for heart or lung issues, acute and chronic bronchitis |
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Radon
The health risks associated with radon exposure are due to the radioactive particles released during its decay. These particles can be inhaled, causing lung damage and increasing the risk of lung cancer. Long-term exposure to high levels of radon can also lead to non-cancerous diseases such as the thickening of lung tissues. However, it is important to note that the effects of radon-induced cancer may take several years to become apparent.
Testing for radon is essential to mitigate its potential health risks. Do-it-yourself test kits and professional testing services are available to determine radon levels in homes and buildings. If elevated radon levels are detected, mitigation systems can be installed to collect and vent the gas outdoors, reducing indoor radon concentrations.
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Carbon monoxide
The major sources of indoor carbon monoxide include tobacco smoke, gas stoves, wood stoves, fireplaces, gas and kerosene-fueled space heaters, gasoline engines, and attached garages. Incomplete oxidation during combustion can cause high concentrations of carbon monoxide in indoor air. Additionally, the use of portable generators inside homes, garages, or similar areas can lead to a quick buildup of deadly carbon monoxide levels.
The effects of carbon monoxide exposure can vary depending on age, overall health, and the concentration and duration of exposure. At low concentrations, symptoms may include fatigue in healthy individuals and chest pain in those with heart disease. Higher concentrations can cause impaired vision and coordination, headaches, dizziness, confusion, and nausea. Carbon monoxide poisoning may be difficult to identify as the initial symptoms are similar to the flu, and victims may ignore the early signs. However, continued exposure can lead to severe health consequences, including loss of consciousness.
To prevent carbon monoxide poisoning, it is recommended to install carbon monoxide alarms in homes and to properly maintain ventilation systems and combustion appliances. Annual professional inspections of fuel-burning appliances, such as furnaces, stoves, fireplaces, and water heaters, are also advised to detect potential carbon monoxide leaks.
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Nitrogen dioxide
NO2 is a highly reactive oxidant and corrosive substance. It is toxic and acts as an irritant to the mucosa of the eyes, nose, throat, and respiratory tract. High doses of NO2 exposure, such as during a building fire, can cause pulmonary edema and diffuse lung injury. Prolonged exposure to elevated levels of NO2 can also contribute to acute or chronic bronchitis.
The primary indoor sources of NO2 are combustion processes, such as tobacco smoke, gas-, wood-, oil-, kerosene-, and coal-burning appliances. Gas stoves and space heaters are the most common indoor sources of NO2 emissions. Other sources include improperly vented furnaces, water heaters, and clothes dryers. The amount of indoor air pollution produced depends on the fuel type, the design of the stove or appliance, and the enclosure design. The use of gas and solid fuel stoves is strongly associated with higher NO2 concentrations, with peaks coinciding with meal preparation times.
Indoor NO2 levels are influenced by the presence of NO2-emitting appliances, the indoor-outdoor air exchange rate, and seasonal variations. Winter levels tend to be higher due to increased gas appliance usage and reduced ventilation.
NO2 is a significant indoor air pollutant, and control measures to reduce NO2 emissions will also decrease the emissions of other nitrogen oxide species.
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Tobacco smoke
ETS is a significant source of indoor nitrogen dioxide (NO2) and carbon monoxide (CO). It is well-established that exposure to ETS can cause serious health issues and even premature death. The toxic and carcinogenic compounds in ETS can lead to lung cancer, cardiovascular disease, reproductive issues, and other diseases. It is especially dangerous for vulnerable groups, such as infants, children, the elderly, and individuals with respiratory conditions.
Secondhand tobacco smoke can spread throughout a building, including between rooms and apartment units. While ventilation, filtration, and air cleaning techniques can reduce ETS levels, they do not eliminate it completely. The large number of people exposed to ETS, coupled with its harmful health effects, poses a significant public health concern.
The ToPIQ study (ToPIQS) aims to investigate the concentration of indoor ETS-dependent particulate matter (PM) and its impact on indoor air quality. By using a self-made ETS emitter (ETSE), researchers can generate ETS and measure the concentration of different particulate matter fractions (PM10, PM2.5, and PM1) in various microenvironments. This research is crucial for understanding the health risks associated with indoor ETS exposure.
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Biological pollutants
Common sources of biological pollutants include animal dander (minute scales from hair, feathers, or skin), dust mites, pollen, and mould. These substances can be found in every home, even those that are spotlessly clean. Bathrooms, damp or flooded basements, wet appliances such as humidifiers or air conditioners, and even some carpets and furniture can provide the necessary conditions for biological pollutants to grow, namely nutrients and moisture.
The impact of biological pollutants on health varies from person to person. While some individuals may not experience any adverse reactions, others may suffer from allergic reactions, which can range from mild discomfort to life-threatening asthma attacks.
In addition to allergic reactions, biological pollutants can cause or contribute to infectious diseases caused by bacteria and viruses, such as the flu, measles, chickenpox, and tuberculosis. These illnesses can spread indoors, especially in crowded conditions with poor air circulation. Some bacteria and viruses can circulate through indoor ventilation systems, as seen with Legionnaire's disease and Pontiac Fever, which have been linked to large buildings with poor air conditioning or heating systems.
The presence of biological pollutants in indoor environments can have significant implications for health, particularly for vulnerable individuals such as infants, young children, the elderly, and those with chronic illnesses. Therefore, it is essential to be aware of potential sources of biological pollutants and take appropriate measures to control their growth and buildup, such as maintaining proper ventilation and addressing moisture issues.
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Frequently asked questions
The top indoor pollutant is carbon monoxide (CO). It is produced by tobacco smoke, gas stoves, wood-burning, and fireplaces, among other sources.
Exposure to carbon monoxide can cause headaches, fatigue, and queasiness. At very high levels, it can lead to brain and heart damage and even death.
Other common indoor air pollutants include nitrogen dioxide (NO2), particulate matter (PM2.5 and PM10), radon, biological pollutants like dust mites and pet dander, and volatile organic compounds (VOCs).
Indoor air pollutants can trigger various health issues, including respiratory and cardiovascular diseases, asthma, lung cancer, and "sick building syndrome," where occupants experience similar symptoms when inside a particular building.
Indoor air pollution can be reduced by proper ventilation, using air cleaners, maintaining heating and cooling systems, and preventing the use of combustion sources like tobacco smoke and wood-burning inside homes.
