New Source Review

Smokestacks from a power plantNew Source Review (NSR) is a program of the federal Clean Air Act that covers the construction of new major-emitting industrial facilities and construction at existing facilities that will significantly increase pollution emissions.


Federal New Source Review (NSR) regulations became effective on August 7, 1980, with the goals of protecting human health and welfare, ensuring economic growth while also protecting existing clean air environments, and protecting the air quality in areas with pristine scenic, historic, and natural recreational value.

The NSR program (a part of the federal Clean Air Act) covers:

  1. construction of new major emitting industrial facilities, and
  2. existing facilities that make major modifications that significantly increase pollution emissions.

The program requires that in either of these cases, a permit must be obtained before construction. The permit will be issued only if the new plant or major modification includes pollution control measures that reflect the best pollution-control technology available.

More information

For more information or assistance, contact the MPCA at 651-296-6300 or 1-800-657-3864. Or send a question through the Ask MPCA Web-based form.

For more information on determining applicability of NSR: PDF icon Facts about Determining Applicability of New Source Review

For more information on determining Best Available Control Technology (BACT) and other NSR requirements: PDF icon Facts about New Source Review.

Additional information about NSR is available on the EPA Web site: