Nitrogen Dioxide (NO2)
NO2 is produced by combustion, degradation of organic matter, and oxidation of NO. It is one of the few colored gases and gives a brownish tint to polluted air. NO2 is visible at concentrations as low as 1 ppmv, and is oxidized to HNO3 in the atmosphere. It also hydrolyzes and disproportionates to give HNO3 and HNO2.
NO2 is slightly soluble in water. The Henry's law constant for NO2 is 1.0x10-2 mol/atm. The partial
pressure of NO2 in the atmosphere is 1-5x10-9 atm.
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