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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.

January 5, 1983 Accumulations of Emissions 4.21

The language in the preamble to the PSD regulations could indicate that EPA intended to accumulate deminimus emission increases at a stationary source, but the regulations themselves did not indicate this. The regulatory language has been interpreted to exclude from the regulations any modification that did not in and of itself result in a significant emission increase, even though when combined with other modifications the criteria for a significant emission increase would be met. Policy considerations included: 1) EPA and industry resources should not be directed to "small" changes and, 2) applying BACT to the last modification triggering the review would be wasteful. It was also noted that the deminimus increase would be included when considering contemporaneous emission increases and decreases.

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