Bronte Wells
Air pollution is a mix of hazardous substances from both human-made and natural sources. It is caused by solid and liquid particles and certain gases that are suspended in the air. These particles and gases can come from car and truck exhaust, factories, dust, pollen, mold spores, volcanoes, and wildfires. Mobile sources such as cars, buses, planes, trucks, and trains account for more than half of all air pollution in the United States. Stationary sources include power plants, oil refineries, industrial facilities, and factories. Area sources are agricultural areas, cities, and wood-burning fireplaces, while natural sources include wind-blown dust, wildfires, and volcanoes. Air pollution has been associated with various diseases, including heart and lung problems, cancers, and other health issues, making it a major threat to global health and prosperity.
| Characteristics | Values |
|---|---|
| Sources of air pollution | Mobile sources (cars, buses, planes, trucks, trains), stationary sources (power plants, oil refineries, industrial facilities, factories), area sources (agricultural areas, cities, wood-burning fireplaces), natural sources (wind-blown dust, wildfires, volcanoes) |
| Primary mobile source of air pollution | Automobiles |
| Major cause of air pollution in cities | Ozone |
| Gaseous criteria air pollutants of primary concern in urban settings | Sulfur dioxide, nitrogen dioxide, carbon monoxide |
| Sources of sulfur dioxide, nitrogen dioxide, carbon monoxide | Fossil fuels such as fuel oil, gasoline, and natural gas burned in power plants, automobiles, and other combustion sources |
| Formation of ozone | Chemical reactions between nitrogen dioxide and volatile organic compounds (e.g. gasoline vapors) |
| Effects of air pollution on health | Oxidative stress, inflammation in human cells, chronic diseases, cancer, asthma, cardiac problems, respiratory diseases, diabetes mellitus, obesity, reproductive, neurological, and immune system disorders |
| Effects of air pollution on the environment | Climate change, rising sea levels, extreme weather, heat-related deaths, increased transmission of infectious diseases |
| Impact of ammonia (NH3) on health | Contributes to several hundred thousand premature deaths from particulate matter |
| Impact of nitrogen oxides (NOx) | Cause acid rain, threatening wildlife and ecosystems |
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What You'll Learn
Vehicle emissions
Motor vehicles emit both greenhouse gas emissions and air pollutant emissions, which have detrimental effects on the environment, air quality, and human health. Greenhouse gases, such as carbon dioxide (CO2), trap heat from the sun in the Earth's atmosphere, leading to the greenhouse effect and climate change. Carbon dioxide is the main greenhouse gas produced by motor vehicles. A typical passenger vehicle emits about 4.6 metric tons of CO2 per year, and the average vehicle emits approximately 400 grams of CO2 per mile. The amount of emissions can vary depending on the vehicle's fuel, fuel economy, and mileage. In addition to CO2, vehicles also emit methane (CH4) and nitrous oxide (N2O) from their tailpipes.
Air pollutant emissions from motor vehicle exhausts include particulate matter (PM), nitrogen oxides (NOx), and volatile organic compounds (VOCs). These emissions contribute to smog formation, which can irritate the eyes and throat and damage the lungs, especially in vulnerable individuals such as children, the elderly, and those with asthma or allergies. Motor vehicle exhausts also produce hazardous air pollutants, such as benzene, formaldehyde, and diesel particulate matter, which are known or suspected to cause cancer and other serious health issues.
The transportation sector is a significant contributor to air toxics, and mobile source hazardous air pollutants have been a growing concern. However, EPA standards and regulations have helped reduce these emissions over the years, with a 50% reduction since 1990. The implementation of clean vehicle and engine technology, as well as improvements in fuel quality, are also contributing to the effort to decrease vehicle emissions and improve air quality.
While electric vehicles (EVs) have gained popularity as a more environmentally friendly alternative, it is important to note that they still emit a small amount of greenhouse gases due to air conditioner/HFC leakage. However, they do not produce tailpipe emissions, and fuel cell electric vehicles (FCEVs) operating on hydrogen only emit water vapor.
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Industrial processes
One of the key pollutants emitted by industrial processes is nitrogen oxide, a noxious gas that is harmful to both human health and the environment. Nitrogen oxide is produced during the combustion of fossil fuels, particularly in industries such as power generation and oil and gas development. Other pollutants emitted include ammonia, mercury, and carbon dioxide, which contribute to global warming and climate change.
The production of electricity, waste treatment and management, livestock rearing, and cement manufacturing are also significant sources of industrial air pollution. For example, the natural gas, plastic, chemical, and waste disposal industries can generate hazardous waste that, if not properly disposed of, can create air pollution.
In addition, certain manufacturing industries, such as iron, steel, and rubber product manufacturing, release polycyclic aromatic hydrocarbons (PAHs) as a by-product, which are organic compounds containing carbon and hydrogen. PAHs are known to be widespread in the environment and have been linked to negative health outcomes, including cancer.
The impact of industrial emissions on human health and the environment is significant. According to estimates, industrial emissions cause damage totaling billions of dollars annually to human health and nature. The EU has implemented rules and directives to tackle industrial pollution, aiming to reduce emissions and achieve a zero-pollution, climate-neutral economy by 2050.
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Fossil fuels
Nitrogen oxides, for example, contribute to the formation of smog and acid rain. Smog, or ground-level ozone, occurs when emissions from burning fossil fuels react with sunlight. It can irritate the eyes and throat and damage the lungs, especially in children, the elderly, and people with asthma or allergies. Additionally, the deposition of excess nitrogen from nitrogen oxides or ammonia back onto land pollutes water bodies, leading to harmful algal blooms and oxygen-deprived aquatic zones that are toxic to aquatic life.
Particulate matter, another byproduct of fossil fuel combustion, consists of tiny particles of chemicals, soil, smoke, dust, or allergens that are carried in the air. The smallest airborne particles in soot can penetrate the lungs and bloodstream, exacerbating respiratory conditions and increasing the risk of heart attacks.
Carbon dioxide (CO2) emissions from fossil fuels are a significant driver of climate change. As a greenhouse gas, CO2 traps heat in the Earth's atmosphere, leading to rising global temperatures. The concentration of CO2 in the atmosphere has increased substantially since the beginning of the industrial era, and it continues to rise, impeding efforts to limit global warming. In 2023, carbon dioxide emissions from fossil fuels reached record levels, with a 1.1% increase compared to 2022 levels.
In addition to air pollution, fossil fuels also contribute to water pollution. Oil spills and the use of fracking fluids can contaminate groundwater and drinking water with toxic substances such as arsenic, lead, chlorine, and mercury. Furthermore, the extraction, transportation, and refining of fossil fuels can lead to oil spills that harm wildlife, destroy habitats, and erode shorelines.
Lastly, plastic pollution is another consequence of fossil fuel use, as over 99% of plastics are derived from fossil fuels. Approximately 300 million tons of plastic waste are generated globally each year, with a significant portion ending up in the ocean, endangering marine life and polluting the food chain.
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Agricultural activities
Agricultural pollution refers to the contamination of the environment and surrounding ecosystems as a byproduct of farming practices. This includes animal waste, which is a major contributor to air, soil, and water pollution. Animal manure releases methane, a greenhouse gas, and can also contaminate water sources through runoff. Livestock manure management alone accounts for 12% of all agricultural greenhouse gas emissions in the United States, according to the EPA.
Fertilizers and pesticides used in agriculture can also contaminate water sources through runoff. High levels of fertilizer and manure from the Mississippi River, for example, have caused a recurring "dead zone" in the Gulf of Mexico, where eutrophication, or the overgrowth of algae, has decimated fish and shellfish populations. Similarly, phosphorus runoff from poultry waste has harmed waterways.
Agricultural management practices can further affect emission levels. For instance, tillage levels can impact nitrous oxide emissions, a greenhouse gas contributing to climate change. The use of pesticides and fertilizers in conventional farming has caused enormous damage to local ecosystems, soil health, biodiversity, groundwater, and drinking water supplies.
Additionally, agricultural activities can lead to air pollution through land use changes and animal agriculture practices. These practices have been associated with an increased concentration of atmospheric NH3 gases, which can be converted into NOx compounds. A greater amount of NOx compounds can result in the acidification of aquatic ecosystems and cause respiratory issues in humans.
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Natural sources
Volcanic eruptions can emit massive amounts of sulphur dioxide, hydrogen sulfide, radon, sulfuric acid, hydrogen, carbon monoxide, hydrogen chloride, hydrogen fluoride, helium, and other gases into the atmosphere. These gases can increase background pollution levels for years, even in areas far away from the original source.
In addition to these, methane released by livestock is a significant natural source of pollution. Livestock, especially cows and sheep, release large amounts of methane through belching and flatulence. Methane is a colourless gas produced in their stomachs when bacteria break down the food they eat. Livestock is the biggest source of methane globally, and it is the second most important greenhouse gas, capable of causing climate change.
Another natural source of air pollution is particulate matter, which refers to solid or liquid compounds suspended in the air. Particulate matter is typically categorized into two groups: PM2.5 and PM10, referring to particles with diameters of 2.5 micrometres or smaller, and 10 micrometres or smaller, respectively. In dry regions like deserts, high winds can lift sand and dust particles, causing sandstorms that release large amounts of particulate matter into the air.
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Frequently asked questions
Most air pollution comes from human-made sources, such as vehicle emissions, fuel oils, industrial processes, and power generation.
The primary sources of human-made air pollution are mobile sources, such as cars, trucks, planes, and trains. Stationary sources include power plants, oil refineries, and factories.
Natural sources of air pollution include dust, pollen, mold spores, wildfires, and volcanic eruptions.
Air pollution has been associated with respiratory diseases, cardiovascular problems, cancer, and other serious health issues. It is responsible for millions of deaths globally each year.
Air pollution can be reduced by implementing pollution controls, transitioning to cleaner energy sources, and regulating emissions from vehicles and industries.
