FAQs about Air Pollution

7. What is photochemical smog?

This phenomenon was observed for the first time in the city of Los Angeles, United States, in 1943. Its origin is the combination of nitrogen oxides and volatile organic compounds from the exhaust of vehicles. The mixture, reacting under solar radiation, produces ozone and peroxyacyl nitrate, darkening the atmosphere. Photochemical smog is also characterized by its reddish-brown color. Its components are harmful to living beings and various materials. It can cause respiratory diseases such as rhinitis, bronchitis, asthma, pneumonia and other pathologies.

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Air pollution in big cities is also a topic
At first sight the concern about air pollution, smog or pollution in cities, has been relegated to the background by universal and more alarming issues, which monopolize more headlines, such as global warming, climate change…

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