define Air pollution, the presence in or introduction into the air of a substance which has harmful or poisonous effects., types of air pollution?, Natural sources,Human activity, Photochemical Smog, Photochemical Smog forms when exhaust from vehicles or pollution from factories reacts with light., where is the ozone layer located?, The ozone layer is part of the atmosphere. It’s located about 15-35 km above earth’s surface..

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