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35723 
Technical Report 
Workbook for estimating visibility impairment 
Latimer, DA; Ireson, RG 
1980 
U.S. Enviornmental Protection Agency 
Research Triangle Park, NC 
EPA-450/4-80-031 
This workbook is designed to provide three screening procedures to assist in determining the potential impacts of an emissions source on a Federal Class I area's visibility. It does not address the cumulative impacts of multiple sources on regional haze. A level-1 analysis involves a series of conservative screening tests to eliminate sources with little potential for visibility impairment during hypothetical worst-case meteorological conditions. If impairment is indicated, a more resource intensive level-2 analysis is warranted. If both analyses indicate impairment, a level-3 analysis using a plume visibility model should be used. Two example applications are provided; for a coal-fired power plant and a cement plant. 
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          Chapter 10