Causes of Large Increases in Atmospheric Ammonia in the Last Decade across North America.

Annual NH 3 concentrations are used for generating trends. For any given site with a significant trend in atmospheric NH 3 , the total percentage increase between the start and end year is calculated, taking the start year as the base.

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At the other 10 sites, the adjusted annual NH 3 concentrations showed stable trends at MN18, PA00, WI07, OK99, and MI96, no trend at NM98 and IN99, an increasing trend at NM99, and a likely decreasing trend at IL11 (figure not shown).

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