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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).
Industrial smog occurs in foggy, cool weather typical of that experienced in the British Isles and the eastern seaboard of the United States. Photochemical smog, on the other hand, occurs in hot, dry climates, and particularly on sunny days. Cities noted for this type of smog, such as Los Angeles, Tokyo and Mexico City, are typically surrounded by mountains that prevent air circulation. While industrial smog is most intense in the early morning, photochemical smog peaks at midday.