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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.

April 1, 1987 PSD Questions 4.7 4.26

A decrease in emissions is not considered creditable if it occurred beyond the 5 year contemporaneous time frame even if it was made federally enforceable within a 5 year period. The actual decrease in emissions must occur within the five year contemporaneous timeframe.

If a modification to a major SO2 source will cause a reduction of SO2 to below the major source threshold and a greater than de minimus increase in TSP. In order for PSD review to apply, the source must maintain a major status.

Non-profit health and educational facilities are eligible for an exemption from PSD review. If there is a change to a source's non-profit status the exemption may or may not be effected. The effect of a change of a source's non-profit status upon its PSD exemption is dependent on the nature of the change. The Agency will review any such change in status on a case-by-case, source specific basis.

The definition of municipal solid waste that should be used when determining a possible exemption under 52.21(b)(2). The definition in the NSPS for Incinerators, 40 CFR 60.51(b) should be used.

"Steam generating unit" as defined in 40 CFR 60.41 is the appropriate term to use when considering an exemption under 52.21(b)(2)(iii)(d).

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