New 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.
The purpose of this NSR Web Clearinghouse is to assist and simplify the application of the 2003 NSR Reform regulations. This web page provides rule and policy information, links to additional resources and contact information. As the reforms to the rule are implemented, this page will provide examples, sample calculations and clarifications.
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:
- construction of new major emitting industrial facilities, and
- 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.
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: Facts about Determining Applicability of New Source Review
For more information on determining Best Available Control Technology (BACT) and other NSR requirements: Facts about New Source Review.
For more information about permit modifications and NSR Reform, see the MPCA training manual (June 2004).
Additional information about NSR is available on the EPA Web site: