Arizona Air Quality Information

Yuma streak of no ozone exceedances coming to an end?


High pressure and light winds are forecast to gain a foothold over the Desert Southwest, bringing ideal conditions for ozone accumulation this week. The summer solstice (June 21st) is also right around the corner allowing for strong ultraviolet radiation to create new ozone. Ultimately, regional ozone buildup is likely downwind of the Los Angeles metropolitan area and towards Yuma, resulting in an Ozone High Pollution Advisory being issued for Yuma effective Tuesday, June 11.

Looking back in the pollutant record for Yuma, an exceedance of the current federal health standard set by the U.S. Environmental Protection Agency (daily 8-hour average of 70 parts per billion) would break a current streak of 356 days without one! Furthermore, having our first ozone exceedance of the year in June is not typical. Last time that occurred was June 11, 1995. Otherwise, the average first ozone exceedance (dating back to 1979) is April 30th.

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