High ozone and fine particulate matter concentrations are pervasive regional air quality concerns in the U.S. Increasingly, states preparing plans for attainment with the National Ambient Air Quality Standards (NAAQS) will be challenged with accounting for the regional and longer-range transport of these pollutants and their precursors and with the higher marginal costs of additional permanent or annual emissions reductions. Electric generating units (EGUs) contribute to the regional nature of air pollution as sources of sulfur dioxide (SO_2), which contributes to acid rain and secondary aerosol formation, and oxides of nitrogen (NO_x), which contributes to both of these air quality concerns in addition to ground-level ozone formation, among other atmospheric pollutants.
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