[{"from": "human", "value": "Describe this molecule. [N][=Branch1][C][=O][OH0]"}, {"from": "gpt", "value": "The molecule is 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)"}]