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Air Quality division reports monitoring and permitting gains, flags ozone challenge linked to summertime heat and transport
Summary
Bryce Bird, director of the Division of Air Quality, told the committee the state is meeting monitoring QA goals and has reduced PM2.5 values on the Wasatch Front, but ozone levels have flattened recently. He highlighted a 179B modeling demonstration showing ~10% international contribution to summertime ozone and legislative funding for dust monitors around the Great Salt Lake.
Bryce Bird, director of the Utah Division of Air Quality, briefed legislators on monitoring, permitting and compliance work and outlined next steps to address summertime ozone and dust from the West Desert.
Bird said the division meets key EPA data quality goals — "we have 99% of our air quality data that meets that completeness and quality assurance requirements" — and reported a PM2.5 design value on the Wasatch Front that is roughly half what it was 25 years ago. The division’s permit average is under 131 days and it issues 87% of permits within 180 days. On compliance metrics, Bird reported a 91.5% compliance rate for inspected sources.
Bird told the committee that progress on ozone has flattened in recent years, and hotter drier summers combined with increased transported emissions make local progress harder. He described a 179B demonstration (Clean Air Act provision) used to model how much ozone precursor emissions arrive from outside the region; the demonstration found roughly 10% of summertime ozone‑forming emissions originate from international sources. Bird said EPA was expected to publish approval of that demonstration for public comment imminently.
The division is building a dust‑monitoring network (legislative funds and Great Salt Lake Commission support) to better understand emissions from the Great Salt Lake and West Desert, and Bird said the program has installed six focus monitors so far. Bird also outlined technical controls under consideration to reduce reactive volatile organic compounds — paints, solvents and gasoline emissions — and said the division will pursue regulatory, industry and outreach approaches to meet Clean Air Act obligations.
Bird urged that members consult the division’s annual report and offered staff support for forthcoming bills, including work on ozone state implementation plans and regional haze and sulfur dioxide planning. Committee members asked clarifying questions about statewide versus Salt Lake Valley metrics; Bird said the PM2.5 figures he cited were for the Salt Lake Valley, the state’s worst air‑quality area.
