Nitrogen Dioxide

**Semantic type:** Hazardous or Poisonous Substance

**Definition:** Found in the atmosphere as a key ingredient in photochemical formation of smog and acid rain, Nitrogen Dioxide is a poisonous gas that forms during combustion. Toxic at high concentrations, it reacts with moisture in the air to form nitric acid, highly corrosive and hazardous to plants and animals. (NCI04)

**Synonyms:** - NITROGEN DIOXIDE