2018 had the fewest number of exceedances of the 84 ppb and 75 ppb standards since 1990, with only 24 exceedances of the 84 ppb standard (77% reduction since 1990) and 74 exceedances of the 75 ppb standard (52% reduction since 1990)
2018 was a record-setting year for ozone progress with the fewest number of days exceeding both the 84 ppb and 75 ppb 8-hour ozone standards since 1990
In 2018, the Valley continued to demonstrate ongoing ozone progress by achieving a new record low design value of 90 ppb, which is now only 6 ppb away from attaining the 84 ppb standard.
In 2018, the Valley continued to demonstrate ongoing ozone progress by achieving a new record low design value of 90 ppb, which is now only 6 ppb away from attaining the 84 ppb standard, despite record wildfire smoke impacts during the summer peak ozone period in 2018.
Despite significant wildfire smoke impacts across the Valley, 2018 continued the declining trend in the Valley’s 8-hour ozone design value; now only 6 ppb away from attaining the 84 ppb federal 8-hour ozone standard.
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