To satisfy the United States Environmental Protection Agency (U.S. EPA) requirement to submit a Reasonable Further Progress (RFP) contingency measure that provides for additional ozone National Ambient Air Quality Standards emission reductions in the event that the South Coast Air Basin (Basin) fails to comply with an applicable Clean Air Act milestone, amendments to Rule 445 are proposed that would establish contingency measures for the applicable ozone standards. Specifically, Proposed Amended Rule 445 would: 1) establish an automatic Basin-wide No-Burn day that is triggered when the daily maximum 8-hour ozone air quality is forecast to exceed 80 parts per billion (ppb) in any Source Receptor Area; 2) automatically reduce the ozone threshold to 75 ppb and 70 ppb if the U.S. EPA makes a secondary and tertiary finding, respectively, of a failure to comply with a milestone or attainment requirement by the applicable due date ; and 3) add contingent ozone No-Burn days to the definition of wood-burning season (currently November, December, January, and February) to include additional months (September, October, March, and April). Existing rule provisions regarding PM 2.5 remain unchanged. Other minor proposed amendments include additional definitions of terms used in the rule, and revisions
to improve rule implementation and clarify existing requirements.