Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog.
Some air pollutants are poisonous. Inhaling them can increase the chance you'll have health problems. People with heart or lung disease, older adults and children are at greater risk from air pollution. Air pollution isn't just outside - the air inside buildings can also be polluted and affect your health.
Environmental Protection Agency
- AirNow: Local Air Quality Conditions and Forecasts (Environmental Protection Agency, Office of Air Quality Planning and Standards)
- Bad Air Day (National Institutes of Health) Also in Spanish
- Disparities in the Impact of Air Pollution (American Lung Association)
- Protect Yourself: Respirators (Occupational Safety and Health Administration) - PDF
- Risk Assessment for Toxic Air Pollutants: A Citizen's Guide (Environmental Protection Agency)
- Acid Rain (Environmental Protection Agency)
- Particle Pollution (Centers for Disease Control and Prevention)
- Particulate Matter (PM) Pollution (Environmental Protection Agency, Office of Air Quality Planning and Standards)
- Transportation, Air Pollution, and Climate Change (Environmental Protection Agency)
- Volcanic Gases (U.S. Geological Survey)
- ClinicalTrials.gov: Air Pollution (National Institutes of Health)