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 Action Day
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Air Quality Index (AQI)
observed at 7:00 MST
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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. |
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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| Air Quality Index (AQI) |
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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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Moderate |
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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]
Clouds have already begun to move over Arizona from the west this morning. Cloud cover looks to be possible through the weekend and on Monday as well. Skies should then clear out more on Tuesday as high pressure begins to build over the region. In general, light winds and stagnant conditions are expected each day through at least Tuesday. Also, high temperatures will be their warmest--low 70s--Saturday and Sunday.
Air quality-wise, not much is expected to change from what we have been seeing lately. Stagnant conditions will be favorable for accumulation of PM10 (dust) and PM2.5 (smoke, soot) in the morning and overnight hours, but mainly PM2.5. As a result, PM2.5 is expected to finish in the Moderate Air Quality Index (AQI) category each day of this forecast period. PM10 will also have the potential to reach the Moderate category, but more so on weekdays.
Locations south and southwest of the Phoenix metro area will have the greatest potential at seeing Moderate AQI levels for either pollutant. But locations elsewhere around the Valley could also see Moderate PM2.5 levels over the weekend.
The main concern, however, is Saturday night into Sunday. Last Sunday (12/9), PM2.5 exceeded the federal health standard, primarily because of high PM2.5 levels in the morning. Whether or not a similar outcome will happen this weekend is uncertain, but forecast hourly PM2.5 levels on Sunday have been increased to account for the possibility of higher levels.
M. Graves
http://azdeq.gov/phoenix/forecast
Last Update: Friday, December 14, 2018, 9:37 AM |
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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)
Tribal Boundaries
