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Effects of Photochemical Smog Photochemical smog's effects cause damage to the respiratory system and environmental systems with the release of nitrogen oxide (NO), ozone and volatile organic compounds (VOCs).
Photochemical Smog. Photochemical smog is a type of air pollution caused by nitrogen oxide, hydrocarbons and sunlight. Nitrogen oxide is commonly produced from the internal combustion of engines. Photochemical smog is often prevalent in some of the sunnier U.S. cities, such as Los Angeles.