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

Decadal trends of atmospheric ammonia (NH₃) and their potential causes were explored through the analysis of monitored data collected at 15 sites in the United States and 7 sites in Canada. Large percentage increases in the annual average concentration of atmospheric NH₃, for example, >100% at 6 sites and 40-100% at 10 sites, were observed over the most recent 8-13 year period. In contrast, a decrease or a narrow variation in NH₃ emissions was reported at the state or provincial level in both countries during the same period. Decreased emissions of SO₂ and NO across North America in the past decade would have reduced the chemical loss of atmospheric NH₃ to form particulate NH₄ ⁺. Such a chemical mechanism was verified through regression analysis at about half of the monitored sites, where the increasing trends in atmospheric NH₃ were partially explained by the reduced NH₄ ⁺. Excluding the reduced contribution from this chemical loss to generate the adjusted annual NH₃ concentration through two approaches, no decreasing trends can be obtained to align those in emissions at most sites, implying that other factors also contributed to the increase in the annual NH₃ concentration. Correlation analysis results implied that enhanced drought conditions and increased ambient temperatures also likely contributed to the increasing trend in the annual NH₃ concentration at some sites. The large percentage increases in the annual NH₃ concentration cannot be fully explained by all the identified causes, leading to oppugning the reality of the decrease in NH₃ emissions reported across North America in the recent decade.