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The burning and combustion of fossil fuels releases many air pollutants.  Such include, carbon monoxide, carbon dioxide, sulfur dioxide, and particulate matter. The release of these pollutants into the air causes the development of ozone, photochemical smog, and acid deposition.
- The Clean Air Act allows the EPA to regulate the usage of lead, which decreased the amount of lead in the atmosphere.
- Air pollutants come from primary or secondary pollutants

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- Photochemical smog can harm human health in several ways, including respiratory problems and eye irritation.
- Can be reduced through the reduction of nitrogen oxide and VOCs.
- VOCS evaporate at room temperature, trees are a natural source of VOC
- Caused by the reaction of nitrogen oxides and volatile organic hydrocarbons with heat and sunlight, as well as a host of environmental factors. These nitrogen oxides are made early in the day
- Often occurs in urban areas due to the amount of vehicles located in these areas.

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- During a thermal inversion, the normal temperature gradient in the atmosphere is altered as the air temperatures at the Earth's surface is cooler than the air at higher altitudes.
- Thermal inversion traps pollution close to the ground, especially smog and particulates.

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- Reduction of air pollutants include regulatory practices, conservation practices, and alternative fuels.
- Vapor recovery nozzles prevent fumes from escaping into the atmosphere when pumping gas into vehicles.
- Catalytic convertors convert pollutants in exhaust
- Reduction of air pollution form coal-burning power plants include scrubbers and electrostatic precipitators.

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- CO2 appears naturally in the atmosphere from sources such as respiration, decomposition, and volcanic eruptions (variety of natural sources of particulate matter)

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-Indoor air pollutants, such as carbon monoxide (asphyxiant), and particulates can come from different sources. sources include radon, mold, and dust, human-made sources (insulation), paneling, and carpets, as well as combustion, which includes carbon monoxide, nitrogen oxides, and sulfur dioxide.
- Radon gas can infiltrate homes as it moves up through the soil and enters homes via basement or cracks within walls/ foundations. Can also be dissolved through groundwater that enters homes through wells.
- Exposure to radon gas can lead to lung cancer (second leading cause of lung cancer in America)

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- Sources of noise pollution include urban areas of transportation, construction, and domestic and industrial activity. Noise pollution is sound at levels that are high enough to cause physiological stress/ hearing loss.
- Some effects of noise pollution on animals in ecological systems include stress, masking of sounds used to communicate or hunt, damage hearing, and lead to a change in migratory routes.

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- Acid rain and decomposition are due to nitrogen oxides and sulfur oxides from anthropogenic and natural sources in the atmosphere.
- Nitric oxides that cause acid decomposition come from motor vehicles and coal-burning power plants. Sulfur dioxides that cause acid decomposition from coal-burning power plants.
- Acid deposition can be caused by nitric oxides from motor vehicles and coal-burning power plants, as well as sulfur dioxides from coal-burning power plants. However, the effect that acid deposition depends on the regional differences in soils and bedrock.
- Acid rain and decomposition can lead to the acidification of soil and bodies of water and corrosion of human-made structures.