Note: EPA no longer updates this information, but it may be useful as a reference or resource.
Please see www.epa.gov/nsr for the latest information on EPA's New Source Review program.
March 16, 1989 Use of Allowable
Emissions for National Ambient Air Quality Standards (NAAQS) Impact
Analyses Under the Requirements for Prevention of Significant
Deterioration (PSD) 6.25
The required PSD air quality impact analysis for
new major sources and major modifications is to be
based on allowable emissions, rather than actual
emissions, from existing background sources.
However, actual annual operations at an existing
source may be considered, primarily with respect
to evaluating long term NAAQS impacts.
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