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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.

June 3, 1983 Net Emission Increase Under PSD 4.24

Sources and control agencies are not required to aggregate individual changes below PSD de minimus levels over time. Although the regulations are unclear, SSCD's interpretation is that individual de minimus changes need not be aggregated because 1) aggregation could impose a significant resource burden on sources which may never be subject to PSD, 2) controls would have minimum air quality benefit because they would only be required on the last change, 3) air quality would be protected because the changes would consume increment.

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