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According to MedlinePlus, air pollution is a mixture of solid particles and gases in the air, such as car emissions, chemicals from factories, dust, pollen and mold spores. Ozone, a gas, is also major part of air pollution in urban areas. Smog is formed when ozone creates pollution. Moreover, some air pollutants may be poisonous. Some common causes of air pollution are solid and liquid particles and certain gases that are suspended in the air from car and truck exhaust, factories, dust, pollen, mold spores, and natural disasters such as volcanoes and wildfires.
All information above are based on: https://medlineplus.gov/airpollution.html
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