Ozone is not emitted, but formed through a chemical reaction between sunlight and gases like nitrogen oxides, carbon monoxide and volatile organic compounds (VOC) explains the US Environmental Protection Agency (EPA).
These gases are emitted by the burning of carbon based or fossil fuels.
The State of the Air 2016 found that air quality had improved over the decades, with a 69% reduction in pollution since 1970, even though it was marked by growth in industries, energy use and mileage.
Pollution levels have continued to fall from 2012 to 2014.
Air is the breath of life, yet there are many kinds of air pollution contributing to problems that range from human health issues to climate change.
acquired trait: A phenotypic characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation (for example, the large muscles of a weightlifter).The two forms of air pollution considered most harmful to humans by the American Lung Association are ozone or smog, and particle pollution or soot.Ozone is considered the most prevalent air pollutant by the American Lung Association.However, with the addition of man-made greenhouse gases, too much heat is reflected back into the atmosphere, giving rise to global warming.Beginning with the Industrial Revolution, man has added to that production of greenhouse gases, primarily by the burning of fossil fuels.
Clearing of forests, use of nitrous oxide in fertilizers, and gases used in refrigeration and industries are adding to this problem points out National Geographic. air quality standards are specified by the EPA in their National Ambient Air Quality Standards Table (NAAQS).