Maintenance, Startup, and Shutdown (MSS)

The following information is intended strictly as guidance to assist with issues regarding permitting of emissions from MSS activities. Final determinations on any specific submittals will be based on the review of the Air Permits Division and could be different from the information provided below. Further, information on this page could change as the division continues to develop procedures for processing applications.

  • January 2008 Policy Memo relating to application deadlines for regulated entities with multiple Standard Industrial Classification (SIC) codes.


  • Environmental Trade Fair presentations from May 2007
    • Permitting Planned Maintenance, Startup, Shutdown (MSS) - Steve Hagle, P.E. (PDF)
    • Update on Refinery & Chemical MSS Issues - Dana Poppa Vermillion, P.E. (PDF)


  • Current MSS Best Available Control Technology (BACT) for various facility types.


  • Questions (PDF) received in response to the presentations made at the Advanced Air Permitting Seminar in September 2006.

Questions? We Can Help

If you have questions regarding this information please contact us.