Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Friday Forecast:

Alert: Ozone High Pollution Advisory in effect for Friday. Health Impacts >

Ozone

101 AQI
Max 8-hr Avg: 71 ppb

PM10

48 AQI
24-hr Avg: 52 µg/m3

PM2.5

33 AQI
24-hr Avg: 7.8 µg/m3

Saturday Forecast:


Ozone

93 AQI
Max 8-hr Avg: 68 ppb

PM10

45 AQI
24-hr Avg: 49 µg/m3

PM2.5

34 AQI
24-hr Avg: 8.1 µg/m3

Sunday Forecast:


Ozone

87 AQI
Max 8-hr Avg: 66 ppb

PM10

40 AQI
24-hr Avg: 43 µg/m3

PM2.5

33 AQI
24-hr Avg: 7.9 µg/m3

Monday Forecast:


Ozone

84 AQI
Max 8-hr Avg: 65 ppb

PM10

54 AQI
24-hr Avg: 61 µg/m3

PM2.5

58 AQI
24-hr Avg: 15.5 µg/m3

Tuesday Forecast:

Alert: Ozone High Pollution Watch in effect for Tuesday Health Impacts >

Ozone

105 AQI
Max 8-hr Avg: 72 ppb

PM10

52 AQI
24-hr Avg: 57 µg/m3

PM2.5

49 AQI
24-hr Avg: 11.7 µg/m3

Air Quality By Pollutant:

Pollutant
Friday
7/1/2022
Saturday
7/2/2022
Sunday
7/3/2022
Monday
7/4/2022
Tuesday
7/5/2022
O3
101
93
87
84
105
PM10
48
45
40
54
52
PM2.5
33
34
33
58
49
Pollutant
FRI
SAT
SUN
MON
TUE
O3
101
93
87
84
105
PM10
48
45
40
54
52
PM2.5
33
34
33
58
49
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Today through the weekend, a trough of low pressure is expected to develop along the West Coast, with the large ridge of high pressure moving eastward and centering itself over the southeast portion of the United States. This pattern will bring a drier southwest to northeast flow to the region, meaning thunderstorm chances in Phoenix will be minimal today into this weekend. With that said, we may see some storms try to approach the far E/NE Valley this afternoon, with some gusty outflows winds possible as well, but the chance of storms in the Valley will only be slight.

By July 4th into next week, the trough will begin to shift northeast as the high moves back to the west. This shift may set up a more southerly flow allowing for a slight increase in thunderstorm chances by the 4th as moisture increases. This will also increase the risk of outflow winds in the Valley, which may produce blowing dust.

As for air quality, expecting similar conditions today as yesterday, and with two monitors exceeding the federal health standard for ozone yesterday, it will be very likely again today, so an Ozone High Pollution Advisory is in place. Tomorrow through July 4th, expect enough southwest breezes at the surface and stronger winds just above the surface to help keep ozone below the federal standard, so no High Pollution Watches or Advisories will be in place this weekend. By Tuesday of next week, with lighter winds as the high moves back westward, expecting ozone values to once again rise, so an Ozone High Pollution Watch will be issued.

The other air quality concern will be July 4th itself. While we do not typically exceed from July 4th festivities alone, PM-2.5 (smoke) levels do normally rise during the evening hours, and that is expected to be the case this year as well. We could also see some outflow winds producing some blowing dust during the late afternoon/evening hours on July 4th. Stay alert to quick changes in weather conditions if you have outdoor plans!

Have a great weekend!

- M. Pace
ADEQ Meteorologist


What Flag Should I Fly?

Saturday: Yellow
Sunday: Yellow

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Ozone & Your Health

People most vulnerable to the impacts of air pollution include children, older adults, adults exercising outdoors, people with heart or lung disease, and those suffering from asthma and bronchitis. Exposure to ozone can increase the number and severity of asthma attacks, cause or aggravate bronchitis or other lung disease, and reduce the body's ability to fight infection. Symptoms may include itchy eyes, nose and throat, wheezing, coughing, shortness of breath, chest pain and upper respiratory issues | View ADEQ Ozone Fact Sheet >

Please help reduce ozone by doing one or more of the following:
  • Drive as little as possible, carpool, use public transit or telecommute
  • Re-fuel your vehicle in the evening
  • Avoid waiting in long drive-thru lines, if possible
  • Use low-VOC (Volatile Organic Compounds) or water-based paints, stains, finishes and paint strippers - delay big painting projects
  • Make sure containers of household cleaners, garage and yard chemicals, and other solvents are sealed properly to prevent vapors from evaporating into the air