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DEQ proposes federal air rule updates including lower PM2.5 standard, methane controls and I/M removal
Summary
DEQ asked lawmakers to incorporate federal air-regulatory changes, including EPA’s lowered annual PM2.5 standard and new methane and VOC controls for the oil-and-gas sector, while removing a vehicle I/M plan for Northern Ada County.
The Idaho Department of Environmental Quality presented rule docket 5-801-012401 to incorporate federal air-quality requirements through July 1, 2024, and maintain state primacy in implementing the Clean Air Act.
"This chapter is including incorporation by reference and I know that's not a favorite, of federal air quality regulations," Air Quality Division Administrator Tiffany Floyd told the committee. The docket covers updates to align Idaho rules with federal changes and to maintain the state’s primacy so Idaho can implement federal Clean Air Act obligations rather than EPA.
Key federal updates DEQ cited: EPA lowered the annual National Ambient Air Quality Standard for PM2.5 (fine particulate matter) from 12 µg/m³ to 9 µg/m³, effective May 2024; DEQ said it expects statewide monitors to meet the new standard after exceptional wildfire events are removed from monitoring data, though several communities (Pinehurst, St. Maries, Salmon) are near the standard. DEQ also noted EPA’s rule revisions adding methane and VOC controls for oil-and-gas well sites and associated equipment, removal of the vehicle carbon-monoxide inspection-and-maintenance requirement from the Northern Ada County plan, and deletion of a Title V emergency affirmative-defense provision after litigation; states now exercise enforcement discretion in those emergency cases.
Floyd said DEQ will reinstate certain definitions that had been removed earlier in the agency’s 0-based regulation review (to clarify terms such as "open burning," "toxic air pollutant," and "CAS"), and that the incorporation by reference covers federal actions through July 1, 2024. She described outreach and education work in communities where PM2.5 is driven by wood-stove use and discussed the exceptional-events process for wildfire smoke impacts on monitors. DEQ recommended the committee approve the pending rule when the committee takes votes at a later session; no vote occurred at this hearing.
