TRACE gases in the atmosphere, such as H2S and S02, NH3 and N02 and some organic trace gases, such as pinenes, are considered as “potentially” formers of aerosols and it is generally accepted that the atmospheric aerosol with particle sizes less than about 0.1 radius results from chemical reactions in the gas phase involving those gases. The exact mechanisms of aerosol formation are, however, still unclear. The fact that the ammonium ion NH4+ is a very common constituent of aerosols with particles of radius < 1 µm as well as of precipitation and dry deposition does confirm the participation of ammonia in the overall phase transition process.
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KIANG, C., STAUFFER, D. & MOHNEN, V. Possibilities for Atmospheric Aerosol Formation involving NH3. Nature Physical Science 244, 53–54 (1973). https://doi.org/10.1038/physci244053a0
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