Emissions ambient nitrogen effects

The Clean Air Act (CAA) limits the emission of pollutants into the atmosphere and protects human health and the environment from the effects of airborne pollution. The EPA established National Ambient Air Quality Standards (NAAQS) for several substances. The NAAQS provide the public some protection from toxic air pollutants. Primary responsibility for meeting the requirements of the CAA rests with each state. States must submit plans for achieving NAAQS compliance. Under section 112 of the CAA, the EPA has the authority to designate hazardous air pollutants and set national emission standards for hazardous air pollutants. Common air pollutants include the following (1) ozone, (2) nitrogen dioxide, (3) carbon monoxide, (4) particulate matter, and (5) sulfur dioxide. 

The continued worldwide lowering of ambient SO2 concentration standards is expected to further increase the use of acid plant tail gas scrubbing as an effective means of decreasing acid plant SO2, SO3, nitrogen oxides, and H2SO4 mist emissions. 

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