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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 22, 1981 PSD Applicability 4.13

The first step for determining a net emissions increase is to assess if the modification itself will cause a significant increase in any regulated pollutant. If there will be a significant increase, the 5-year contemporaneous time period is triggered and all creditable increases and decreases during this period should be assessed. If after evaluating the creditable increases and decreases, there is still a significant increase in emissions PSD review applies. If the modification itself will not cause a significant increase, the contemporaneous time period is not triggered and PSD review will not apply.

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