Ozone is one of the major pollutants that has not decreased significantly in the lower levels of the atmosphere since the passage of the Clean Air Act. It is mostly produced by:

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Ozone is produced when volatile organic compounds (VOCs) and nitrogen oxides (NOx) react in the presence of sunlight. These pollutants come from the imperfect burning of petroleum products, such as gasoline in vehicles, and industrial emissions. Coal plants and nuclear plants do not contribute significantly to the production of ozone in the lower levels of the atmosphere. Biofuels can potentially reduce the production of ozone, depending on their production and usage. The use of aerosol cans was a major contributor to ozone depletion in the upper atmosphere but has been regulated under the Montreal Protocol.

Ozone Is One of the Major Pollutants That Has Not