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_20180717_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.
 - 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.
 - 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 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 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 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 3:00 MST
74
Moderate
Health Message: Unusually sensitive people should consider reducing 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.
AQI - Pollutant Details
Ozone 54 Moderate
Particles (PM10) 74 Moderate
Particles (PM2.5) 47 Good
Air Quality Forecast
Today Tomorrow
Air Quality Index (AQI)
108
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)
93
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
AQI - Pollutant Details
Carbon Monoxide
7
Good
Ozone
108
Unhealthy for Sensitive Groups
Particles (PM10)
26
Good
Particles (PM2.5)
34
Good
Carbon Monoxide
8
Good
Ozone
93
Moderate
Particles (PM10)
38
Good
Particles (PM2.5)
32
Good
Forecast Discussion: Another cloudy start to the morning as debris clouds from storm activity on Sunday evening continue moving through the area. Several weak disturbances can also be seen rotating through the state that even helped kick off a few showers around the Valley this morning, with Sky Harbor officially measuring a trace of rain.

For today, expecting skies to become partly cloudy early this afternoon which will allow for temperatures to rise to just above 100 degrees. Winds are also forecast to be light which will enable ozone to build-up in the Valley. The only caveat will be outflow winds moving through the region later this afternoon that may disrupt the plume, so what are the odds of storms this afternoon?

To say the least, the moisture in the atmosphere has been at/near record levels for the past several days. The latest sounding from Phoenix shows precipitable water (a measure of how much water is within the atmosphere) at 1.99 inches which is above the old record for the day of 1.85 inches and well above the average of 1.44". With that said, the atmosphere is primed with moisture, and any storms that do form will be capable of producing very heavy rain.

For today, the best chance of storms will be to the north and east of the Valley. With cloud cover across the region this morning, expecting a slightly later start to thunderstorm activity, meaning storms will not attempt to move into the Valley until later this afternoon giving ozone plenty of time to build-up. The winds in the middle of the atmosphere are also fairly weak which will make it more difficult to get storms to move into the Valley. As a result, we will keep the Ozone High Pollution Advisory in effect for today. With all of this said, there will still be a chance for isolated storms in Phoenix this afternoon/evening due to how much moisture is available.

Tomorrow, high pressure will continue to be centered along an axis from the Four Corners to just north of Los Angeles. At the same time, an area of low pressure is moving westward through Mexico which will act to increase the easterly flow across the state. While this would generally be a good thing for storms in the Valley as stronger easterly winds will easily support storms moving off the mountains and into Arizona, water vapor shows drier air moving eastward through New Mexico right now and will likely move into eastern Arizona tomorrow which could limit thunderstorm activity slightly.

As for ozone on Tuesday, not expecting as cloudy of a start to the day with mostly sunny skies by the early afternoon. With overall light winds, will issue another Ozone High Pollution Advisory for the Valley.

By Wednesday into Friday, the monsoon ridge will be centered along an axis from Texas through Nevada. This will continue an east/southeast flow allowing for the daily chance of thunderstorms across the state. On Wednesday, a weak disturbance will move through the region increasing the threat for thunderstorms and outflow winds moving from east to west. As a result of thunderstorm chances Wednesday afternoon and debris cloud cover on Thursday, ozone levels are forecast to be slightly lower.

Overall, another complex forecast this week with regard to monsoon thunderstorm activity and air quality. Stay tuned as we will continue to monitor the ever-changing weather patterns closely!

–M. Pace
http://www.azdeq.gov/forecasting
Last Update: Monday, July 16, 2018, 9:21 AM
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