Livestock production and nitrogen fertilizer used in croplands emit lots of ammonia, which is the most abundant alkaline gas in ambient air. In recent years, Chinese scientists have suggested reducing ammonia emissions as an effective measure to alleviate aerosol pollution because ammonia can react with acidic gases to form aerosols and pollution.
Click here for original story, Ammonia emitted from fertilized paddy fields mostly does not end up in air
Source: Phys.org