Kiera Jefferson
Air pollution is a mix of hazardous substances from both human-made and natural sources. These sources include vehicle emissions, fuel oils, natural gases, manufacturing by-products, power generation, and chemical production. Air pollutants can be categorized into two groups: particle pollution and criteria air pollutants. Particle pollution, or particulate matter, is made up of tiny pieces of solids or liquids in the air, such as smoke, dust, and ash. Criteria air pollutants, on the other hand, are a group of six common air pollutants regulated by the EPA due to their harmful effects on human health and the environment. These pollutants include ground-level ozone, carbon monoxide, lead, nitrogen oxides, and sulfur oxides. Both types of air pollutants pose significant risks to human health and the environment, contributing to respiratory issues, environmental damage, and even deaths worldwide.
| Characteristics | Values |
|---|---|
| Particle pollution/particulate matter | Tiny pieces of solids or liquids in the air, including smoke, dust, sulfates, nitrates, carbon, mineral dusts, etc. |
| Particle size | PM10 (larger particles that irritate the eyes, nose, and throat) and PM2.5 (smaller particles that can get into the deep parts of the lungs or even the blood) |
| Sources of particle pollution | Vehicle emissions, fuel oils, natural gas, manufacturing by-products, power generation, chemical production, wildfires, etc. |
| Hazardous air pollutants (HAPs) | Benzene, perchloroethylene, methylene chloride, dioxins, asbestos, toluene, cadmium, mercury, chromium, lead compounds, etc. |
| Ground-level ozone | Created by the reaction of pollutants from cars, power plants, industrial boilers, refineries, etc. in the presence of sunlight; a major constituent of smog |
| Other pollutants | Carbon monoxide, lead, nitrogen oxides, sulfur oxides, ammonia gas, etc. |
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What You'll Learn
Particulate matter (PM)
PM is not a single pollutant but a mixture of many chemical species. It is composed of small droplets of liquid, dry solid fragments, and solid cores with liquid coatings. The particles vary widely in size, shape, and chemical composition and may contain inorganic ions, metallic compounds, elemental carbon, organic compounds, and compounds from the earth’s crust.
PM10 and PM2.5 often have different emission sources and chemical compositions. PM10 is made up of larger particles, such as dust from roads, farms, dry riverbeds, construction sites, and mines. These particles irritate the eyes, nose, and throat and can induce adverse health effects when inhaled.
PM2.5, on the other hand, consists of fine particles that are 2.5 micrometers or less in diameter. These particles are more dangerous as they can penetrate deep into the lungs and even enter the bloodstream. Long-term exposure to PM2.5 has been linked to premature death, especially in individuals with chronic heart or lung diseases, and impaired lung development in children. It is also the main cause of reduced visibility (haze) in some regions of the United States.
It is important to monitor air quality alerts, such as the Air Quality Index (AQI), to protect oneself from harmful levels of PM. Taking appropriate actions, such as spending more time indoors and reducing strenuous outdoor activities, can help minimize exposure to particle pollution.
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Ground-level ozone
The primary sources of the pollutants that contribute to ground-level ozone include motor vehicles, homes, industries, and power plants. About 95% of nitrogen oxides from human activity come from burning coal, gasoline, and oil, while volatile organic compounds primarily result from gasoline combustion, oil and gas production, residential wood combustion, and the evaporation of liquid fuels and solvents. Natural sources, such as coniferous forests, also contribute to the formation of ground-level ozone.
Ozone levels tend to be higher in urban areas, particularly during hot and sunny weather conditions. However, wind can transport ozone over long distances, leading to high levels even in rural regions. To address the issue of ground-level ozone and improve air quality, governments and organizations like the EPA work to reduce emissions and implement regulations. These efforts include designating areas with high ozone levels as "nonattainment" and collaborating with states to develop implementation plans for improving air quality.
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Carbon monoxide
CO is a significant air pollutant due to its impact on human health and the environment. When inhaled, CO reduces the amount of oxygen delivered to the body's organs and tissues, particularly the heart and brain. Exposure to CO can cause chest pain, reduced exercise capacity, and other cardiovascular issues, especially for those with heart disease. Even healthy individuals can experience harmful effects, such as vision problems, reduced cognitive function, and difficulty performing complex tasks.
Outdoor air pollution from CO is primarily attributed to vehicles and machinery burning fossil fuels. Cars, trucks, and other fossil fuel-powered engines are the greatest sources of outdoor CO emissions. Additionally, natural sources such as wildfires and forest fires contribute to outdoor CO levels.
Indoor sources of CO include wood stoves, gas stoves, malfunctioning or improperly vented gas appliances (such as water heaters, furnaces, and clothes dryers), space heaters, fireplaces, and tobacco smoke. CO levels indoors can be significantly higher than outdoors, especially during colder months when inversion conditions trap air pollution near the ground.
To mitigate the harmful effects of CO pollution, organisations like the U.S. Environmental Protection Agency (EPA) have implemented standards and regulations. Under the Clean Air Act, the EPA sets and reviews standards for CO in outdoor air, working with state, tribal, and local agencies to ensure CO levels are maintained at safe levels. These efforts are crucial for protecting public health and welfare, as CO is known to adversely affect human health and contribute to climate change.
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Nitrogen oxides
Nitric oxide (NO) and nitrogen dioxide (NO2) are the two primary nitrogen oxides associated with combustion. The higher the combustion temperature, the greater the amount of nitric oxide produced. Typically, 90-95% of nitrogen oxides are emitted as nitric oxide, while 5-10% are emitted as nitrogen dioxide. However, nitric oxide rapidly oxidises in the air to form nitrogen dioxide, which is why the latter is often considered the primary pollutant.
Road traffic, including cars, trucks, and buses, is the main outdoor source of nitrogen dioxide. Power stations and other industrial and domestic combustion processes also contribute significantly to nitrogen dioxide emissions. Indoors, tobacco smoke and the burning of fuels such as gas, wood, oil, kerosene, and coal in appliances like stoves, ovens, and heaters are significant sources of nitrogen dioxide.
Nitrogen dioxide irritates the airways in the human respiratory system. Short-term exposure can aggravate respiratory diseases, especially asthma, leading to coughing, wheezing, and breathing difficulties. Prolonged exposure to elevated levels of nitrogen dioxide may contribute to the development of asthma and potentially increase susceptibility to respiratory infections.
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Sulfur oxides
SO2 dissolves in water vapour in the air to form acids, and it can also react with other gases and particles to form sulphates and other harmful products. These sulphates and acids can cause adverse effects on the respiratory systems of humans and animals, as well as damage vegetation, buildings, and materials. They also contribute to the acidification of aquatic and terrestrial ecosystems.
SO2 is emitted into the air as a result of fossil fuel combustion and other industrial processes, with power plants and industrial facilities being the largest sources of SO2 emissions.
Other sulfur oxides, such as SO3, are found in the atmosphere at much lower concentrations than SO2. However, high concentrations of SOx can harm trees and plants, reducing foliage and decreasing growth.
SO2 and other sulfur oxides contribute to the formation of particulate matter (PM) pollution, which can penetrate deeply into the lungs and cause health problems. They also contribute to acid rain, which can harm sensitive ecosystems.
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Frequently asked questions
The six criteria air pollutants are ground-level ozone, particle pollution, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead.
Particle pollution, also known as particulate matter, is made up of tiny pieces of solids or liquids in the air. These include smoke, dust from roads, farms, dry riverbeds, construction sites, and mines. Some particles are large enough to be visible, while others are so small that they can enter the deep parts of your lungs or even your bloodstream.
Examples of HAPs include benzene (found in gasoline), perchloroethylene (emitted from dry cleaning facilities), and methylene chloride (used as a solvent and paint stripper). Other HAPs include dioxins, asbestos, toluene, and metals such as cadmium, mercury, chromium, and lead compounds.
TRAP is a mixture of gases and particles, primarily from human-made sources such as vehicle emissions, fuel oils, natural gas, industrial emissions, and power generation, particularly coal-fueled power plants.
Natural sources of air pollution include smoke from wildfires, ash and gases from volcanic eruptions, and methane emitted from decomposing organic matter in soils.
