#pollution  undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities
  supertype:  environmental_condition  impureness
  subtype:  biodegradable_pollution__biodegradablepollution  pollution that is rendered harmless by natural processes and so causes no permanent harm
  subtype:  nonbiodegradable_pollution  pollution that accumulates in the environment and may appear in the food chain
  subtype:  air_pollution__airpollution  pollution of the air; "air pollution reduced the visibility"
     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
  subtype:  noise_pollution__noisepollution__sound_pollution__soundpollution  annoying and potentially harmful environmental noise
  subtype:  thermal_pollution__thermalpollution  harm to lakes and rivers resulting from the release of excessive waste heat into them
  subtype:  water_pollution__waterpollution  pollution of the water in rivers and lakes

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