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Industrial production almost all of dilute nitric acid oxidation of the first NOx ammonia gas mixture, Then water or low concentrations of nitrate mixed gas absorption. Because NOx special chemical characteristics, nitrate absorption tower can not be completely absorbed there is always a certain concentration with the NOx emissions. Although nitrate production exhaust emissions only to industrial atmospheric emissions of NOx fraction of the total. Because of the relative concentration of emissions to the local level greater environmental damage, caused serious harm to human health, Hence the need for related environmental properly discharge its maximum concentration and maximum emission rate provisions. By nitrate industrial production methods, the scale of production characteristics and pollutant treatment modalities scene investigation and research questionnaire, China's industrial production and nitrate pollution control status of economic, technical assessments, with referen