Data and Forecasts courtesy of:
Action Day
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Air Quality Index (AQI)
observed at 16:00 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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Ozone |
31
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Good |
Particles (PM10) |
23
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Good |
Particles (PM2.5) |
29
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Good |
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Air Quality Index (AQI) |
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Moderate |
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion. |
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Air Quality Index (AQI) |
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Moderate |
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion. |
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Forecast Discussion: [View the ADEQ Hourly Forecast for Phoenix] Satellite imagery this morning reveals a plume of upper-atmospheric moisture extending from well off the coast of the Baja Peninsula northeastward up into Arizona. This plume is the reason for the upper-level cloud cover over the Valley this morning and thus, the fiery sunrise. Upper-level clouds are expected to hang around today and through the weekend as the plume stays in place.
Then by Sunday, a wave of low pressure from the Pacific Ocean will begin to move over the Southwest and provide the Valley with its next rain chances. The window for rain currently looks to be between Sunday morning and Monday morning, and forecast rainfall totals range from 0.10-0.25". But there is uncertainty in the exact outcome. Winds are forecast to remain light each day, slightly picking up on Sunday.
Air quality-wise, PM2.5 (smoke, soot) will be the main pollutant of interest as it will have the potential to reach the Moderate Air Quality Index (AQI) category each day through Tuesday. As typical, PM2.5 levels would be expected to be highest over the weekend with increased residential fireplace usage (especially this time of year).
However, on Sunday, any rain would help to reduce PM2.5 build-up and limit its daily AQI value. But the exact timing and amount of rainfall will determine how high PM2.5 levels reach. PM2.5 is forecast in the Moderate AQI category on Sunday to account for the possibility of less rain.
M. Graves http://azdeq.gov/phoenix/forecast Last Update: Friday, December 6, 2019, 9:31 AM |
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