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RACC: 2025 ozone season one of the cleaner years in a decade, but 70 ppb attainment looks unlikely
Summary
Staff reported 2025 produced ‘one of the best years in over a decade’ for ozone monitoring, with daily exceedances down but the three‑year design values at highest monitors showing less improvement; staff warned favorable weather largely drove this year’s results and that attaining a 70 ppb standard next year appears unlikely.
Kelly Brooks, a staff presenter for the Regional Air Quality Council, told the board the 2025 ozone season produced substantially improved monitoring results compared with recent years but cautioned the gains are partly meteorological. "This season was a pretty good season," Brooks said, and later described the year as "one of the best years we've seen in over a decade." She explained the agency's monitoring method — hourly raw data aggregated into 8‑hour rolling averages and then reduced to a three‑year design value used to assess attainment of EPA standards — and stressed that the numbers shown are…
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