One monitor saw daily ozone reach the Moderate AQI value yesterday. There will be lingering cloud cover today as the rain wraps up. With this in mind, daily ozone levels are expected to stay in the Good AQI range today. Friday is expected to see a slight increase in hourly afternoon values, but should remain in the upper Good category for the 8-hour average. After, brief ridging comes with variable cloud cover through the weekend, and a return to daily Moderate AQI values are forecast.

Rainfall totals yesterday across the Maricopa County area varied from as little as a trace to over 3 inches in Mesa and north in Cave Creek. This kept most areas in the good AQI category for daily PM10 values as it quickly began to limit PM10 production. Although the rainfall is coming to an end this morning, it will still be beneficial to keep PM10 at bay for the next few days. Even this morning's typical increases from industrial activity and construction were lower this morning. This rainfall, along with the decrease in storm activity and lighter winds, will keep PM10 in the Good AQI range through early next week.

- A. Hermansen
ADEQ Meteorologist