Abstract

Acid rain pollution is discussed from the scientific and regulatory perspectives. Adverse effects of acid deposition and transboundary acidification are introduced first. Then, observational efforts and results are elaborated for acid rain precursors, components, and depositions in the USA and China. After that, a photochemical mechanism is presented to describe the formation of inorganic sulfate and nitrate in the global troposphere from anthropogenic emissions. Then, a real regulatory simulation case in support of the formation of the third sulfur emission control area, including coastal California, USA, is illustrated using a step-by-step description. Finally, challenges in simulating acid rain are presented.

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