As the only alkaline gas in the atmosphere, ammonia can react with sulfur dioxide and nitrogen oxides to form secondary fine particles, accelerating the generation of atmospheric haze. Ammonia is therefore considered as a catalyst and accelerator for the widespread haze pollution problem in China. In the past decade, China has made great progress in the prevention and control of atmospheric sulfur dioxide and nitrogen oxide pollution, but little has been done in terms of ammonia emissions control.
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Source: Phys.org