In urban areas, air pollution can come from a variety of sources, including industrial emissions, vehicle exhaust, and residential heating.

Ozone is a major component of smog and is formed when nitrogen oxides and volatile organic compounds react in the presence of sunlight.

Environmental racism, environmental injustice, and environmental inequality are all terms used to describe the disproportionate impact of environmental hazards on certain communities.

Particulate matter, especially fine particles, has been associated with increased risk of cardiovascular diseases such as heart disease and stroke.

The Clean Air Act is a comprehensive federal law that aims to reduce air pollution and protect public health.

Promoting the use of public transportation, encouraging carpooling and ride-sharing, and improving fuel efficiency standards are all effective strategies for reducing air pollution from vehicles.

Air purification, air filtration, and air scrubbing are all terms used to describe the process of removing pollutants from the air.

Sulfur dioxide is a major contributor to acid rain, which is formed when sulfur dioxide and nitrogen oxides react with water vapor in the atmosphere.

Air pollution prevention, air pollution control, and air pollution mitigation are all terms used to describe the process of reducing the amount of pollutants emitted into the air.

Investing in clean energy projects, enforcing environmental regulations, and providing air quality monitors are all examples of environmental justice initiatives.

Air quality assessment, air quality impact analysis, and air quality modeling are all terms used to describe the process of assessing the potential impact of a proposed project on air quality.

Agricultural activities, forest fires, and mining operations are all major sources of air pollution in rural areas.

Exposure reduction refers to the process of reducing the amount of time people are exposed to air pollution.

Requiring industries to install pollution control technologies, investing in green infrastructure, and enforcing environmental regulations are all examples of policies that promote environmental justice.

Air quality monitoring, air pollution monitoring, and environmental monitoring are all terms used to describe the process of monitoring and measuring air quality.