air pollution, harmful substances in the air, often consisting of waste from vehicles or industry, exhaust fumes, the waste gas from an engine, especially a car's, or the pipe the gas .., dust storms, a mass of dust and sand that has been lifted from the ground in very dry areas such as deserts and that is carried by the wind, factory smoke, is the dark, dirty air that comes out of factory chimneys when they burn coal or oil. It contains harmful particles (like soot and dust) and chemicals that pollute the air., purifier, a machine or a substance that removes harmful substances from something:, environmental, relating to the environment:.

Ecological problems

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