Phoenix
 
Data courtesy of:
 

AQI Forecast - http://www.epa.gov/airnow/today/forecast_aqi_20140723_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.
 - http://www.epa.gov/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 Animation - http://www.epa.gov/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: Moderate (51 - 100) AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy (151 - 200) AQI: Very Unhealthy (201 - 300) AQI: Hazardous(301 - 500) 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
Air Quality Forecast
Today's High Tomorrow's High
Air Quality Index (AQI)
104 
Unhealthy for Sensitive Groups
Health Message: Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy exertion outdoors.
ACTION DAY
Air Quality Index (AQI)
87 
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
AQI - Pollutant Details
Ozone
104 
Unhealthy for Sensitive Groups
Particles (PM10)
75 
Moderate
Particles (PM2.5)
35 
Good
Carbon Monoxide
Good
Ozone
87 
Moderate
Particles (PM10)
47 
Good
Particles (PM2.5)
30 
Good
Carbon Monoxide
Good
Forecast Discussion: High pressure currently over southern Colorado will be be moving west towards the Four Corners the next few days. As it expands and strengthens Wednesday, temperatures will push near 115°F Wednesday and Thursday. The National Weather Service has elevated their Excessive Heat Watch to a Heat Warning. Local forecast models show thunderstorm activity to the east Wednesday afternoon moving west towards the Phoenix forecast area. This could be another teaser situation where storms approach, collapse at the doorstep, and then re-form west of the Valley. As always, any rain is good rain. The best part of this scenario is that outflow from the east bears less dust than outflow from the south would. The shift to a more east-to-west flow near the surface today will lock ozone and precursors in the Valley. The pooling of ozone and precursors could result in an exceedance of the health standard, primarily in the central, north and northwest part of the forecast area. NOAA's air quality model has backed off of exceeding levels for Thursday. This seems appropriate. Aside from the possibility of dust later Wednesday afternoon, PM10 levels are forecast to be in the Good range Thursday and Friday. Check back tomorrow for the latest. Until then, have a good day! -J.Paul

Current Conditions
Air Quality Index (AQI)
observed at 9:00 MST
52
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion.
AQI - Pollutant Details
Particles (PM2.5) 52 Moderate
Ozone 42 Good

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