Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Tuesday Forecast:


Ozone

44 AQI
Max 8-hr Avg: 48 ppb

PM10

69 AQI
24-hr Avg: 92 µg/m3

PM2.5

38 AQI
24-hr Avg: 9.0 µg/m3

Wednesday Forecast:


Ozone

47 AQI
Max 8-hr Avg: 51 ppb

PM10

68 AQI
24-hr Avg: 90 µg/m3

PM2.5

39 AQI
24-hr Avg: 9.3 µg/m3

Thursday Forecast:


Ozone

51 AQI
Max 8-hr Avg: 55 ppb

PM10

69 AQI
24-hr Avg: 92 µg/m3

PM2.5

43 AQI
24-hr Avg: 10.4 µg/m3

Friday Forecast:


Ozone

54 AQI
Max 8-hr Avg: 56 ppb

PM10

67 AQI
24-hr Avg: 88 µg/m3

PM2.5

43 AQI
24-hr Avg: 10.2 µg/m3

Saturday Forecast:


Ozone

47 AQI
Max 8-hr Avg: 51 ppb

PM10

56 AQI
24-hr Avg: 65 µg/m3

PM2.5

38 AQI
24-hr Avg: 9.1 µg/m3

Air Quality By Pollutant:

Pollutant
Tuesday
10/19/2021
Wednesday
10/20/2021
Thursday
10/21/2021
Friday
10/22/2021
Saturday
10/23/2021
O3
44
47
51
54
47
PM10
69
68
69
67
56
PM2.5
38
39
43
43
38
Pollutant
TUE
WED
THU
FRI
SAT
O3
44
47
51
54
47
PM10
69
68
69
67
56
PM2.5
38
39
43
43
38
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Cooler air is filtering into the region today as a trough of low pressure brushes through the state. Yesterday, the high temperature was 86 degrees, and today, forecast highs across the Valley are in the upper 70s to low 80s. Keeping in mind, the average high for this time of year is 88 degrees!

The area of low pressure (currently centered over the Utah/Colorado line) that brought the breezes to the Valley yesterday, will continue to move eastward as high pressure builds back over the area later today through Friday. This pattern will result in mainly light winds along with a warming trend, as afternoon highs rise back into the upper 80s Thursday and Friday.

This weekend, a very weak storm system may brush through the state. Not expecting any rain, but it may increase breezes just slightly on Saturday as well as lower afternoon highs back into the mid-80s.

As for air quality, the main story will be stagnation and overnight/early morning inversions. You might be noticing a bit more haze around the Valley, especially during the morning. This is the time of year when stronger inversions develop in the Valley overnight, which traps all the pollution right near the ground. As temperatures warm during the day, this inversion lifts, allowing the pollution to disperse. However, if there are no winds (like we will see over the next couple of days), the pollution will just settle right back down overnight. As a result, we are forecasting PM-10 (dust) to be in the Moderate AQI category through the rest of the week. You can learn more about these temperature inversions HERE.

Ozone becomes less of a concern this time of year as day lengths become shorter, but with high pressure moving in, expecting a slow rise in concentrations with values forecast to be in the low Moderate AQI category by the end of the week.

- M. Pace
ADEQ Meteorologist


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Tuesday: Yellow
Wednesday: Yellow

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