#air_pollution__airpollution  pollution of the air; "air pollution reduced the visibility"
  supertype:  #pollution  undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities
  subtype:  #acid_rain__acid_precipitation  rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water
  subtype:  #industrial_pollution  pollution resulting from an industrial plant discharging pollutants into the air
  subtype:  #miasma  unhealthy vapors rising from the ground or other sources; "the miasma of the marshes"; "a miasma of cigar smoke"
  subtype:  #smog__smogginess  air pollution by a mixture of smoke and fog

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