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TeachMeFinance.com - explain photochemical smog photochemical smog The term 'photochemical smog' as it applies to the area of Earth observation can be defined as ' A type of smog that forms in large cities when chemical reactions take place in the presence of sunlight, its principal component is ozone. Ozone and other oxidants are not emitted into the air directly but form from reactions involving nitrogen oxides and hydrocarbons. Because of its smog-making ability, ozone in the lower atmosphere (troposphere) is often referred to as 'bad' ozone'. The term 'photochemical smog' as it applies to the area of the weather can be defined as ' Air pollution containing ozone and other reactive chemical compounds formed by the reaction of nitrogen oxides and hydrocarbons in the presence of sunlight'. The term 'photochemical smog' as it applies to the area of carbon dioxide can be defined as ' Air pollution caused by chemical reactions among various substances and pollutants in the atmosphere'. Previous 5 Terms: phonophobia phorometer Phosphorus photic zone photobiology Next 5 Terms: photochemistry photodissociation photoelectric photogrammetry photolith About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.