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_20180718_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 16:00 MST
105
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.
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 105 Unhealthy for Sensitive Groups
Particles (PM10) 37 Good
Particles (PM2.5) 29 Good
Air Quality Forecast
Today Tomorrow
Air Quality Index (AQI)
115
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)
105
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
AQI - Pollutant Details
Carbon Monoxide
8
Good
Ozone
115
Unhealthy for Sensitive Groups
Particles (PM10)
61
Moderate
Particles (PM2.5)
38
Good
Carbon Monoxide
7
Good
Ozone
105
Unhealthy for Sensitive Groups
Particles (PM10)
31
Good
Particles (PM2.5)
33
Good
Forecast Discussion: Ozone ended up in the Unhealthy AQI category on Tuesday at two monitors (Dysart and West Phoenix), with a total of 16 monitors in the Valley exceeding the federal health standard. This is the first time since August 11, 2017, that ozone reached Unhealthy levels. Another note, this is the 29th time so far this year that ozone in the Valley has exceeded the standard, last year at this same time we were at 25 times.

Around midnight an outflow with some dust also moved through the Valley from the south/southwest. This was enough to push two monitors into the Moderate AQI category for today.

So, with Unhealthy ozone on Tuesday, the big question, what is in store today? A similar pattern to yesterday is holding steady with high pressure along an axis the Four Corners to San Fransico as a weather disturbance currently located in northwest Mexico continues moving west. This will set the stage for another day of calmer winds, mainly clear skies and only a slight chance of storms this afternoon. As a result, ozone is forecast to exceed the federal health standard, so an Ozone High Pollution Advisory is in place for Phoenix.

Thursday and Friday, the monsoon high will become more consolidated and be centered over New Mexico and Texas, which will increase the southeast flow in the mid/upper atmosphere as well as increase west/southwest winds at the surface. This should be enough to decrease ozone levels slightly compared to the past few days however values will still be elevated so an Ozone High Pollution Advisory is in effect for tomorrow with another possible on Friday. There are also some indications that a disturbance will rotate through the state on Friday increasing thunderstorm chances, especially across eastern/southeastern Arizona. These storms could bring gusty winds, blowing dust and a slight chance of rain to the Valley by Friday afternoon/evening. Will be watching this possibility closely.

Heading into Saturday and Sunday, high pressure will move directly over Arizona resulting in calm winds and mainly clear skies. This pattern will create prime weather for ozone production, so an Ozone High Pollution Advisory will be possible both days.

Looking out past our forecast period, high pressure will continue to sit directly over Arizona for the first part of next week resulting in excessive heat (110 degrees plus) and likely poor air quality concerning ozone. Stay tuned.

–M. Pace
http://www.azdeq.gov/forecasting
Last Update: Wednesday, July 18, 2018, 8:44 AM
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