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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