Data and Forecasts courtesy of:
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 Action Day
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Air Quality Index (AQI)
observed at 12:00 MST
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Health Message: None |
Note: Values above 500 are considered Beyond the AQI. Follow recommendations for the Hazardous category. Additional information on reducing exposure to extremely high levels of particle pollution is available here. |
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Moderate |
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Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion. |
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| Air Quality Index (AQI) |
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Unhealthy for Sensitive Groups |
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Health Message: The following groups should reduce prolonged or heavy outdoor exertion: People with heart or lung disease, Children and older adults. Everyone else should limit prolonged or heavy exertion. |
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Forecast Discussion: Updated Friday, July 20, 2018 **OZONE HEALTH WATCH IN EFFECT FRIDAY, SUNDAY AND MONDAY, JULY 20, 22-23, 2018** ** PM10 HIGH POLLUTION ADVISORY SATURDAY, JULY 21, 2018 ** A couple of the latest University of Arizona fine resolution forecast model runs have a large complex of storms developing over southeastern Arizona this afternoon and early evening and moving northwest towards the County. The initial complex of storms may not make their way into the County, however a secondary area of vorticity (spin in the atmosphere) is projected to move into the County late tonight during the overnight period and into Saturday morning. The projected associated outflow winds with this secondary complex for central and western portions of the County are in the 25-40 mph range! Therefore widespread blowing dust is expected during the overnight/early morning hours of Saturday and forecasted PM10 levels are over the health standard for several locations around the County. Therefore a PM10 High Pollution Advisory (HPA) has been issued for Saturday. High pressure currently over western Texas and New Mexico will move westward and park itself directly overhead by Sunday/Monday. The afternoon high temperatures will rise and surpass 110 degrees by Sunday and be in the 110-115 range Monday through Wednesday! The Phoenix National Weather Service has issued an Excessive Heat Warning for next Monday through Wednesday Afternoon winds along with the well above normal temperatures will be favorable for ozone development in northern portions of the County and so have mid to upper moderate AQI levels forecast for today and the ozone health watch remains in effect today. The amount of early cloud cover associated with the aforementioned complex of storms early Saturday will play a large part in the overall ozone levels on Saturday (i.e. mid to upper moderate, though just below the ozone health watch criteria). The forecasted ozone levels in northern portions of the County are near the health standard Sunday and Monday, therefore an ozone health watch has been issued for both of those days. Anyone with respiratory and/or heart ailments should limit outdoor activities during the afternoon and early evening hours when ozone levels are at their highest. After Saturday’s early morning dust event the PM10 levels are forecast to be in the good to mid-moderate range on the AQI scale Sunday and Monday. The next uptick in Monsoon activity looks to be the second half of next week. Stay tuned. Stay up to date with current air pollution levels by checking the near real-time PM10, PM2.5 and ozone levels online at http://www.pinalcountyaz.gov/AirQuality/Pages/AirQualityReport.aspx. Forecaster: S. DiBiase |
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AQI: Good (0 - 50)
AQI: Moderate (51 - 100)
AQI: Unhealthy for Sensitive Groups (101 - 150) 
AQI: Unhealthy (151 - 200) 
AQI: Very Unhealthy (201 - 300)
AQI: Hazardous (301 - 500)
National Parks/Monuments
Tribal Boundaries
