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Primary air pollutant in the St. David area:
PM2.5 - 71 Moderate
If you are unusually sensitive to particle pollution, consider reducing your activity level or shorten the amount of time you are active outdoors.
Other Pollutants:
OZONE - 58 Moderate
PM10 - 65 Moderate
[View the ADEQ Hourly Forecast for Tucson]
Air quality-wise, ozone values on Thursday reached the lower Moderate AQI range while particulates remained in the Good AQI category.
Changes are coming, including a slight downward trend in temperatures through the weekend and into the upcoming workweek. Winds pick up by midday Friday which could activate localized particulates and dust, potentially raising PM values into the lower Moderate AQI range. However, the incoming winds should aid ventilation of localized ozone, keeping those values in the Good AQI range.
Clouds return late Friday and into the weekend. Gusty winds return Sunday afternoon, but should not be around for as long of a period as seen Friday night through Saturday. Isolated rain showers develop Sunday afternoon and overnight, which may kick up some additional localized dust. We could see another round of showers for late Monday, in addition to some gusty afternoon winds, which may elevate particulate values.
Ozone values should hold in the Good AQI range as we move into Monday and Tuesday with better ventilation from afternoon winds.
J. Smith
https://azdeq.gov/forecast/tucson
Last Update: Friday, March 27, 2026, 9:02 AM
Primary Pollutant: PM10 - 54 Moderate
Secondary Pollutant: OZONE - 47 Good
Secondary Pollutant: PM2.5 - 52 Moderate
Primary Pollutant: OZONE - 48 Good
Secondary Pollutant: PM2.5 - 46 Good
Secondary Pollutant: PM10 - 42 Good
Primary Pollutant: OZONE - 47 Good
Secondary Pollutant: PM2.5 - 43 Good
Secondary Pollutant: PM10 - 37 Good
Primary Pollutant: OZONE - 49 Good
Secondary Pollutant: PM2.5 - 44 Good
Secondary Pollutant: PM10 - 38 Good