Multiple choice Air pollutants causing photochemical oxidants production include nitrous oxide, nitric acid fumes, nitric oxide ozone, peroxyacetyl nitrate, aldehydes oxygen, chlorine, fuming nitric acid sulphur dioxide Reveal answer Fill a bubble to check yourself B Correct answer Explanation Oxygen chlorine fumes of nitric acid are the air pollutants which caused photochemical oxidants. photochemical oxidants means the pollutants formed under influence of sunlight by complex photochemical reactions.