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NOX Annual Control Period

The CAIR NOX Annual program (subject to subparts AA - II) Control Period is:

  • Jan 1 - April 30, and
  • October 1 – December 31.

The CAIR NOX Ozone Season program (subject to subparts AAAA – IIII) Control Period is:

  • May 1 – September 30.

Electricity-generating Units (EGUs) in the CAIR program are subject to both the NOX Annual and Ozone Season programs.

Non-electricity-generating Units (Non-EGUs) in the CAIR program are only subject to the CAIR NOX Ozone Season program.

For more information, contact Maeve Mason, Regulation and SIP Management Section, Air Quality, at (803) 898-2230.