Phoenix
 
Data and Forecasts courtesy of:
 

 - https://files.airnowtech.org/airnow/today/cur_aqi_phoenix_az.jpg
 
Legend: Tribal Boundaries Tribal Boundaries
The tribal boundaries shown here are provided by the Bureau of Indian Affairs and are intended to be used as a general spatial reference only. They are not a formal determination of tribal boundaries by the EPA.
AQI Forecast - https://files.airnowtech.org/airnow/today/forecast_aqi_20190921_phoenix_az.jpg
 
Legend: Tribal Boundaries Tribal Boundaries
The tribal boundaries shown here are provided by the Bureau of Indian Affairs and are intended to be used as a general spatial reference only. They are not a formal determination of tribal boundaries by the EPA.
AQI Animation - https://files.airnowtech.org/airnow/today/anim_aqi_phoenix_az.gif
 
Legend: Tribal Boundaries Tribal Boundaries
The tribal boundaries shown here are provided by the Bureau of Indian Affairs and are intended to be used as a general spatial reference only. They are not a formal determination of tribal boundaries by the EPA.
 
AQI: Good (0 - 50) AQI: Good (0 - 50)
Air quality is considered satisfactory, and air pollution poses little or no risk.
AQI: Moderate (51 - 100) AQI: Moderate (51 - 100)
Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy for Sensitive Groups (101 - 150)
Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.
AQI: Unhealthy (151 - 200) AQI: Unhealthy (151 - 200)
Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
 AQI:Very Unhealthy (201 - 300) AQI: Very Unhealthy (201 - 300)
Health alert: everyone may experience more serious health effects.
AQI: Hazardous(301 - 500) AQI: Hazardous (301 - 500)
Health warnings of emergency conditions. The entire population is more likely to be affected.
Action DayAction Day
 
Local Air Quality Resources
Maricopa County Air Quality Department | Maricopa County Dust Forecast | Today's AQI and Forecast (AZ DEQ)
 
State Air Quality Resources
ADEQ Contact Information
ADEQ Regional Haze and Visibility
American Lung Association (ALA) of Arizona
Arizona Department of Environmental Quality Air Quality Division
Clean Air Make More - Maricopa County
Gila River Indian Community DEQ Air Quality Program
 
Data and Forecasts courtesy of:
Current Conditions
Air Quality Index (AQI)
observed at 12:00 MST
47
Good
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.
AQI - Pollutant Details
Ozone 47 Good
Particles (PM10) 35 Good
Particles (PM2.5) 27 Good
Air Quality Forecast
Today Tomorrow
Air Quality Index (AQI)
97
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Air Quality Index (AQI)
97
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
AQI - Pollutant Details
Ozone
97
Moderate
Particles (PM10)
47
Good
Particles (PM2.5)
29
Good
Ozone
97
Moderate
Particles (PM10)
41
Good
Particles (PM2.5)
25
Good
Forecast Discussion: [View the ADEQ Hourly Forecast for Phoenix]
What a nice cool morning! Dependent on where you are, temperatures found their way into the 60s! Great coffee weather. The fall season is so close now by the way, officially September 23rd. Afternoons are still on the mild side with quick warm ups back in the 90s.

We are also coming off an outstanding air quality day. All sites, all pollutants in the Good AQI range! The exception to note, however, is West 43rd again. There have been ongoing spikes in PM10 for several days now since last week that are bringing the daily 24-hour average up for that spot in the Valley. Those concentrations have not been representative of the majority of Metro Phoenix.

Ozone is becoming the concern into the weekend. Today, afternoon breeziness is expected to check peak ozone. Saturday and Sunday, the region loses that benefit being in between weather systems. Although ozone is seasonally on a downward spiral so to speak, if you have the right weather conditions such as poor dispersion it doesn't take much for ozone to accumulate. Based on the pronounced drop in dispersion, an Ozone Health Watch will be issued for both Saturday and Sunday. If possible, try to limit pollution contribution by doing such actions as carpooling, using mass transit, and refueling after dark.

Then comes the rain. There has been a lot of discussion about how the weather will shake out late Sunday, Monday, and Tuesday. The overarching context is tropical moisture stemming from Hurricane Lorena (situated on top of Cabo San Lucas this morning) and other concentrations of deep moisture form Tropical Storms Kiko and Mario. In other words, it is busy down there in the tropics!

The moisture is coming, but will we have the atmospheric lift to act on that moisture? The back and forth on whether we receive torrential rain in excess of 1-3 inches (perhaps even greater) or it is a "bust" with much lighter accumulations (under an inch) is highly dependent on track and positon of a Pacific low pressure trough (the source of atmospheric lift) relative to Arizona. That trough is near Alaska at the moment! So, many moving parts indeed! The potentially high impact rainfall scenario over Arizona is testing available weather model guidance.

This is certainly an evolving weather situation that is worth keeping up to date on over the coming days. More time is necessary to work out the details from a forecasting standpoint. For air quality, it is safe to say that sharp improvement is on the way with measurable rain to start next week.

Have a great weekend and stay tuned!


J. Malloy
http://azdeq.gov/phoenix/forecast
Last Update: Friday, September 20, 2019, 10:23 AM
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