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Nitrogen dioxide is the chemical compound with the formula NO2. It is one of several nitrogen oxides.  Nitrogen dioxide is non-flammable and colourless to brown at room temperature. It has a strong, harsh odour and is a liquid at room temperature, becoming a reddish-brown gas above 70F.  NO2 is an intermediate in the industrial synthesis of nitric acid.  Some nitrogen dioxide is formed naturally in the atmosphere by lightning, and plants, soil, and water produce some. However, only about 1% of the total amount of nitrogen dioxide found in our cities’ air is formed this way. Nitrogen dioxide is an important air pollutant because it contributes to the formation of photochemical smog, which can have significant impacts on human health.