Air pollution control, the products and techniques employed to reduce or eliminate the emission into the atmosphere of substances that can harm the environment or human health. The control of air pollution is one of the principal areas of pollution control. Air is considered to be polluted when it contains certain substances in concentrations high enough and for durations long enough to cause harm or undesirable effects. These include adverse effects on human health, property, and atmospheric visibility. The atmosphere is susceptible to pollution from natural sources as well as from human activities. Nevertheless, only pollution caused by human activities, such as industry and transportation, is subject to mitigation and control. The primary focus of air pollution regulation in industrialized countries has been on protecting ambient, or outdoor, air quality.
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