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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).
The most harmful of the gases and pollutants that emitted are particulate matter, carbon dioxide, polycyclic organic matter, and formaldehyde. (b) On plants. Photochemical smog has a deleterious effect on plants. Chronic exposure to ozone may weaken plants and make them susceptible to disease and reduce crop yield.