Overview 



The Clean Air Act of 1977 requires that each state formulate a State 

 Implementation Plan which proposes how each state will attain and maintain 

 clean air within the guidelines of the Clean Air Act. Maine proposed its 

 State Implementation Plan to the Environmental Protection Agency in May, 

 1979. The Maine SIP designates attainment, nonattainment and unclassified 

 areas within the State for six criteria pollutants; it proposes control 

 strategies for areas which are nonattainment; it details a licensing strategy 

 for new sources and modifications in both attainment and nonattainment areas. 

 The program for attainment areas provides for the Prevention of Significant 

 Deterioration within those areas through the imposition of Best Available 

 Control TEchnologies. For nonattainment areas, the program requires new 

 sources or modifications of sources to comply with the Growth Offset Policy 

 which includes the use of Best Available Control Technologies and Lowest 

 Achievable Emission Rates. 



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