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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).
Reaction of oxygen with air. Oxygen gas does not react with itself or nitrogen under normal conditions. However the effect of ultraviolet light upon oxygen gas is to form the blue gas ozone, O 3, the second allotrope of oxygen. Another way to make ozone is by passing a silent electric discharge through oxygen gas.