Photochemical Smog
What is Photochemical Smog?
Photochemical smog is a type of air pollution formed when primary pollutants (primarily nitrogen oxides and volatile organic compounds from vehicle exhaust and industry) react in the presence of sunlight to produce a complex mixture of secondary pollutants including ozone, peroxyacetyl nitrate (PAN), and aldehydes. It forms a brownish haze characteristic of large, sunny cities such as Los Angeles and Mexico City. Photochemical smog causes respiratory problems, reduces visibility, and damages crops and materials.
Key Facts
Frequently Asked Questions
Photochemical smog is a type of air pollution formed when primary pollutants (primarily nitrogen oxides and volatile organic compounds from vehicle exhaust and industry) react in the presence of sunlight to produce a complex mixture of secondary pollutants including ozone, peroxyacetyl nitrate (PAN), and aldehydes. It forms a brownish haze characteristic of large, sunny cities such as Los Angeles and Mexico City. Photochemical smog causes respiratory problems, reduces visibility, and damages crops and materials.