An investigation of the atmospheric HNO 3 -NH 3 -NH 4 NO 3 equilibrium relationship in a cool, humid climate

Simultaneous measurements of gaseous nitric acid and ammonia were made during summer. autumn and winter months in North-West England. Concentrations of HNO 3 and NH 3 lav within the ranges 0.03-0.36 ppb and 0.9-5.1 ppb respectively, gaseous HNO 3 accounting for only about 12% of total nitrate. Under the high humidity conditions prevalent during the work. the concentration data are consistent with the equilibrium of gaseous HNO 3 and NH 3 with solution droplets of NH 4 NO 3 DOI: 10.1111/j.1600-0889.1983.tb00019.x

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