#pollutant  waste matter that contaminates the water or air or soil
  supertype:  waste_material__wastematerial__waste__waste_matter__wastematter__waste_product__wasteproduct  any materials unused and rejected as worthless or unwanted; "they collect the waste once a week"; "much of the waste material is carried off in the sewers"
  subtype:  dichlorodiphenyltrichloroethane__ddt  an insecticide that is also toxic to animals and humans; banned in the United States since 1972
  subtype:  chlorofluorocarbon__CFC  a fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans; "CFCs cause depletion of atmospheric ozone"
  subtype:  halon  a compound in which the hydrogen atoms of a hydrocarbon have been replaced by bromine and other halogen atoms; very stable; used in fire extinguishers although it is thought to release bromine that depletes the ozone layer
  subtype:  nitrogen_oxide  any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials; present in car exhausts
  subtype:  sulfur_dioxide__sulphur_dioxide__sulphurdioxide  a toxic gas (SO2) that occurs in the gases from volcanoes; used in many manufacturing processes and present in industrial emissions

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