Major Modification
This term is used to define modifications of major stationary sources of emissions with respect to Prevention of Significant Deterioration and New Source Review under the Clean Air Act.
Source: Terms of the Environment ...
It also ensures that the best available control technology is applied to major stationary sources and major modifications for regulated pollutants, and consideration of soils, vegetation and visibility affects in the permitting process.
 See also: Emissions, Significant deterioration, Stationary source, Emission, Air
  
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