Smog (Ground-Level Ozone)
Smog (Ground-Level Ozone) : Smog is formed in the Earth's lower atmosphere, near ground level, when pollutants emitted by cars, power plants, industrial boilers, refineries, chemical plants, and other sources react chemically in the presence of sunlight. Ninety per cent of all smog found in urban areas is made up of ground-level ozone-the same chemical found in the stratosphere. In large enough quantities, ground-level ozone can cause respiratory problems in humans and other animals, and damage to plants and building materials
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