User's Guide for the Comply Code (Revision 2)
United States Environmental Protection Agency
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The COMPLY computer program may be used to demonstrate compliance with the National Emission Standards for Hazardous Air Pollutants (NESHAPS) in 40 CFR 61, Subpart I. It has various levels of complexity, the simplest being a computerized version of the tables of concentration and possession limits in EPA89. The most complicated is an air dispersion calculation using a wind rose.