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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.

February, 1981 PSD Significance Levels for Monitoring 7.4

The August 7, 1980, PSD promulgation introduced significance levels of projected ambient impacts for the purpose of determining whether a proposed source or modification would be eligible for an exemption from the requirement for ambient monitoring [40 CFR 51.24(i)(8) and 52.21(i)(8)].

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