Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Monday Forecast:


Ozone

84 AQI
Max 8-hr Avg: 65 ppb

PM10

52 AQI
24-hr Avg: 58 µg/m3

PM2.5

35 AQI
24-hr Avg: 8.5 µg/m3

Tuesday Forecast:


Ozone

61 AQI
Max 8-hr Avg: 58 ppb

PM10

57 AQI
24-hr Avg: 67 µg/m3

PM2.5

40 AQI
24-hr Avg: 9.7 µg/m3

Wednesday Forecast:


Ozone

49 AQI
Max 8-hr Avg: 53 ppb

PM10

66 AQI
24-hr Avg: 86 µg/m3

PM2.5

43 AQI
24-hr Avg: 10.2 µg/m3

Thursday Forecast:


Ozone

67 AQI
Max 8-hr Avg: 60 ppb

PM10

55 AQI
24-hr Avg: 63 µg/m3

PM2.5

39 AQI
24-hr Avg: 9.3 µg/m3

Friday Forecast:


Ozone

84 AQI
Max 8-hr Avg: 65 ppb

PM10

54 AQI
24-hr Avg: 62 µg/m3

PM2.5

38 AQI
24-hr Avg: 9.2 µg/m3

Air Quality By Pollutant:

Pollutant
Monday
4/19/2021
Tuesday
4/20/2021
Wednesday
4/21/2021
Thursday
4/22/2021
Friday
4/23/2021
O3
84
61
49
67
84
PM10
52
57
66
55
54
PM2.5
35
40
43
39
38
Pollutant
MON
TUE
WED
THU
FRI
O3
84
61
49
67
84
PM10
52
57
66
55
54
PM2.5
35
40
43
39
38
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

The Valley was graced with clouds and even a smattering of sprinkles yesterday as a low pressure wave passed overhead. This weather helped to keep ozone levels down, limiting them to the low end of the Moderate Air Quality Index (AQI) category at most.

Today, higher pressure will move over Arizona, resulting in sunnier skies and warmer temperatures than yesterday. High temperatures will return to the upper 80s. Ozone is also expected to increase given the sunny skies (ozone needs sunlight to form) and light winds. PM10 (dust) and PM2.5 (smoke) will be locally driven.

Then on Tuesday, a small low pressure wave will move over northern California, causing winds to pick up out of the southwest in central Arizona. However, high temperatures will continue to increase in the Valley, reaching the low 90s. Ozone levels are forecast to decrease given the winds. Also, elevated PM10 levels may be possible in the afternoon because of the winds.

Come Wednesday, the aforementioned low pressure wave will have arrived in Arizona. The main focus for this day will be the winds, as they are forecast to be the strongest of the week (at least 15-20 mph, with higher gusts). Ozone is forecast in the Good AQI category, but PM10 levels will have the potential to increase more (i.e. blowing dust) given the strength of the winds.

After Wednesday, another wave is projected to affect Arizona on Thursday, followed by higher pressure on Friday. Ozone levels are forecast to trend back upwards during this time. PM10 will become more locally driven again.

- M. Graves
ADEQ Meteorologist


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Monday: Yellow
Tuesday: Yellow

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