This document is being released as a publication of the

Environmental Protection Agency (EPA) in response to a request

from members of the Interagency Workgroup on Air Quality

Modeling (IWAQM). Members include representatives from the

Environmental Protection Agency, U.S. Forest Service, National

Park Service, and U.S. Fish and Wildlife Service. The document

includes recommendations on how to estimate air quality impacts

associated with prevention of significant deterioration due to

sources farther than 50 km from a Class I area. Impacts on

visibility and other air quality related values at all downwind

distances are also addressed. IWAQM recommends that the

MESOPUFF-II model be used for these analyses in a somewhat

different mode than previously suggested by EPA.

The recommendations of IWAQM contained in this document

should be considered interim until more suitable techniques can

be developed and tested. Implementation of these

recommendations is a matter for the appropriate regulatory

agencies and should be done in consultation with the applicable

EPA Regional Office.



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