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Air pollution episodeAn extended period of a high concentration of pollutants in the atmosphere. A public alert or notification of unhealthful air quality. In the U.S., the degree of alert is often based on the pollutant [..]
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Air pollution episodeA period of abnormally high concentration of air pollutants, often due to low winds and temperature inversion, that can cause illness and death. (See: episode, pollution.)
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Air pollution episodeA period of abnormally high concentration of air pollutants, often due to low winds and temperature inversion, that can cause illness and death. (See: episode, pollution.)
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Air pollution episodeA period of abnormally high concentration of air pollutants, often due to low winds and temperature inversion, that can cause illness and death. Also see: episode pollution
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