Brian Barton
Air pollution is the release of various pollutants into the air, which are detrimental to human health and the planet. Pollutants are released into the atmosphere at rates that exceed the environment's capacity to dilute or absorb them. These pollutants include particle pollution, ozone, nitrogen dioxide, carbon monoxide, and sulfur dioxide. They are emitted by industrial processes, power plants, residential heating systems, automobiles, and other combustion sources. According to the World Health Organization (WHO), air pollution is responsible for millions of deaths worldwide each year, with respiratory diseases, cardiovascular diseases, neurological damage, and cancer being common health consequences.
| Characteristics | Values |
|---|---|
| Particle pollution | PM10, dust, smoke, fumes, mists, soot |
| PM2.5, sulphate, nitrates, ammonia, sodium chloride, black carbon, mineral dust, water | |
| Coarse particles: pollen, sea spray, wind-blown dust | |
| Gaseous pollutants | Sulfur dioxide, nitrogen dioxide, carbon monoxide, ozone, volatile organic compounds |
| Sources | Fossil fuels, fuel oil, gasoline, natural gas, combustion sources, power plants, automobiles, industrial processes, residential heating systems |
| Health effects | Respiratory issues, cardiovascular disease, neurological damage, cancer, death |
| Social effects | People of colour more likely to be affected, racist zoning policies, discriminatory lending practices |
| Solutions | Clean Air Act, reducing emissions, regulating air quality standards |
| Spending more time indoors, avoiding busy roads, choosing easier outdoor activities |
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What You'll Learn
Particulate matter (PM)
PM is composed of solids and aerosols composed of small droplets of liquid, dry solid fragments, and solid cores with liquid coatings. These particles vary widely in size, shape, and chemical composition. They may contain inorganic ions, metallic compounds, elemental carbon, organic compounds, and compounds from the earth’s crust.
Some particles are large or dark enough to be seen with the naked eye, such as dust, dirt, soot, or smoke. Others are so small that they can only be detected using an electron microscope. PM2.5, or particles 2.5 micrometres and smaller, are particularly dangerous as they can get into the deep parts of the lungs or even into the bloodstream. These particles are emitted directly from sources such as construction sites, unpaved roads, fields, smokestacks, or fires. Most particles, however, form in the atmosphere as a result of complex reactions of chemicals such as sulfur dioxide and nitrogen oxides.
PM2.5 exposure has been linked to a range of adverse health effects. In California, PM2.5 exposure contributes to approximately 5,400 premature deaths due to cardiopulmonary causes per year. It also leads to about 2,800 hospitalizations for cardiovascular and respiratory diseases and about 6,700 emergency room visits for asthma each year. Long-term exposure to PM2.5 has been linked to premature death, particularly in people with chronic heart or lung diseases, and reduced lung function growth in children.
To protect yourself from harmful levels of PM, you can check the Air Quality Index (AQI) daily, which tells you how clean or polluted the outdoor air is. The AQI also provides information on associated health effects that may be of concern.
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Carbon monoxide (CO)
CO is also a concern for indoor air quality. A variety of household items, such as unvented kerosene and gas space heaters, leaking chimneys and furnaces, and gas stoves, release CO. When CO is inhaled, it reduces the amount of oxygen transported in the bloodstream to critical organs like the heart and brain. This can lead to dizziness, confusion, unconsciousness, and even death at very high levels, which are more likely to occur indoors or in enclosed spaces.
While very high levels of CO are not expected outdoors, elevated outdoor CO levels can be dangerous for individuals with specific types of heart disease. Climate change-induced wildfires and extreme heat contribute to the challenge of maintaining healthy outdoor air quality. To address this, the EPA sets and reviews standards for acceptable CO concentrations in outdoor air, providing data and guidelines to local agencies to ensure that CO levels remain within safe limits.
Additionally, certain populations are disproportionately affected by air pollution, including communities of color and low- to middle-income countries. Racist zoning policies and discriminatory lending practices have historically contributed to this disparity, with polluting industries and busy highways more commonly situated near communities of color. As a result, residents in these areas experience higher rates of respiratory disease, cardiovascular disease, neurological damage, cancer, and other health issues associated with poor air quality.
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Ozone (O3)
Ozone is a dangerous and widespread pollutant, particularly in the United States. It can be transported long distances by wind, affecting even rural areas. Ozone levels tend to be higher on hot sunny days in urban environments, but they can also reach unhealthy levels during colder months.
The health impacts of ozone pollution are significant. Even short-term exposure can cause greater obstruction of airways, as seen in a study of lifeguards in Galveston. Vulnerable groups, including people with pre-existing medical conditions such as lung diseases (e.g., asthma) and metabolic disorders, are at an increased risk of adverse effects. Additionally, evidence suggests that women may face higher respiratory health risks from ozone exposure. Long-term exposure to ozone has been linked to various health issues, including increased respiratory illnesses, metabolic disorders, nervous system problems, reproductive issues, and higher respiratory and cardiovascular-related mortality.
To address ozone pollution, the Clean Air Act has been instrumental in reducing emissions from transportation, power plants, and manufacturing. The EPA has also established national ambient air quality standards (NAAQS) to limit the concentration of ozone in outdoor air based on health criteria. These measures aim to protect public health and improve air quality across the United States.
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Nitrogen dioxide (NO2)
NO2 is one of six widespread air pollutants with national air quality standards limiting their levels in outdoor air. In outdoor air, NO2 is primarily produced by trucks, buses, cars, and other vehicles, as well as industrial processes such as oil and gas production, and coal-fired power plants. The highest concentrations of outdoor NO2 are typically found in large urban regions, with levels being higher on or near heavily traveled roadways.
Indoors, sources of NO2 include appliances such as stoves, dryers, and space heaters that burn natural gas, liquified petroleum gas (including propane and butane), and kerosene. If these appliances are not adequately vented, levels of NO2 can accumulate to unhealthy levels. Tobacco smoke and the burning of wood, gas, oil, kerosene, and coal are also significant indoor sources of NO2.
Nitrogen dioxide has several harmful effects on human health, particularly the respiratory system. Exposure to NO2 can irritate the eyes, nose, and throat, and increase the likelihood of emergency department and hospital admissions. Scientific evidence suggests that NO2 exposure may cause asthma in children and contribute to other respiratory conditions such as chronic obstructive pulmonary disease (COPD). In addition, NO2 can trigger inflammation and cell membrane damage, as seen in cell culture studies.
To protect public health, measures have been implemented to reduce NO2 emissions. For example, the federal Clean Air Act in the United States has helped drive down nitrogen dioxide emissions by enforcing stricter standards for power plants, industrial sites, and on-road vehicles. Despite these efforts, many people still breathe in unhealthy levels of NO2, particularly those living near emission sources or in densely populated urban areas.
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Sulphur dioxide (SO2)
SO2 is a harmful compound that can cause a range of issues for both human health and the planet. When breathed in, SO2 can irritate the eyes, nose, and throat, and in larger quantities, it can contribute to respiratory issues and other health problems. People with asthma may experience worsened symptoms when exposed to SO2.
Additionally, SO2 contributes to acid rain, which can be extremely harmful to sensitive ecosystems. Acid rain occurs when SO2 and other sulphur oxides react with compounds in the atmosphere, forming fine particles that reduce visibility and cause haze. This haze is often observed in national parks and wilderness areas, where it can damage foliage and stunt the growth of plants and trees.
The deposition of these particles can also stain and damage materials such as stone, affecting culturally significant objects like statues and monuments. Furthermore, SO2 emissions can lead to the formation of other sulphur oxides, which can have even more detrimental effects on the environment and human health.
To mitigate the impact of SO2, organizations like the EPA in the United States have implemented rules and standards to reduce SO2 emissions and improve air quality. These measures aim to protect human health and preserve the environment, particularly sensitive ecosystems, from the harmful effects of sulphur dioxide and other pollutants.
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Frequently asked questions
Air pollution is the release of pollutants into the air that are detrimental to human health and the planet.
Gaseous air pollutants include sulfur dioxide, nitrogen dioxide, and carbon monoxide. These gases are emitted directly into the air from the burning of fossil fuels such as fuel oil, gasoline, and natural gas.
Particle pollution, also called particulate matter, is made up of tiny pieces of solids or liquids in the air. Some particles are large enough to be seen, like smoke, while others are so small they cannot be seen. Particle pollution can irritate the eyes, nose, and throat and can have harmful effects on human health.
Particle pollution comes from a variety of sources, including dust from roads, farms, dry riverbeds, construction sites, and mines. Smaller particles, known as PM2.5, can be derived from primary sources such as the combustion of fuels in power generation facilities, industries, or vehicles.
Both long-term and short-term exposure to particle pollution can have adverse health effects. Particle pollution can penetrate deep into the lungs and even enter the bloodstream, leading to cardiovascular and respiratory issues. Long-term exposure has also been linked to lung cancer and adverse perinatal outcomes.
