map showing globa ammonia emissions Credit: Juying Warner/GRL
This map shows global trends in atmospheric ammonia (NH3) as measured from space from 2002 to 2016. Hot colors represent increases due to a combination of increased fertilizer application, reduced scavenging by acid aerosols and climate warming. Cool colors represent decreases due to reduced agricultural burning or fewer wildfires.

Ammonia hot spots found over major global ag areas

Legislation to reduce acid rain in early 1990s most likely had unintended effect of increasing gaseous ammonia in the atmosphere.

The first global, long-term satellite study of airborne ammonia gas has revealed "hot spots" of the pollutant over four of the world's most productive agricultural regions, according to the University of Maryland.

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