Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Tuesday Forecast:


Ozone

54 AQI
Max 8-hr Avg: 56 ppb

PM10

63 AQI
24-hr Avg: 79 µg/m3

PM2.5

45 AQI
24-hr Avg: 10.9 µg/m3

Wednesday Forecast:


Ozone

74 AQI
Max 8-hr Avg: 62 ppb

PM10

58 AQI
24-hr Avg: 70 µg/m3

PM2.5

50 AQI
24-hr Avg: 11.9 µg/m3

Thursday Forecast:


Ozone

80 AQI
Max 8-hr Avg: 64 ppb

PM10

59 AQI
24-hr Avg: 71 µg/m3

PM2.5

51 AQI
24-hr Avg: 12.1 µg/m3

Friday Forecast:


Ozone

87 AQI
Max 8-hr Avg: 66 ppb

PM10

58 AQI
24-hr Avg: 70 µg/m3

PM2.5

52 AQI
24-hr Avg: 12.4 µg/m3

Saturday Forecast:


Ozone

84 AQI
Max 8-hr Avg: 65 ppb

PM10

50 AQI
24-hr Avg: 54 µg/m3

PM2.5

49 AQI
24-hr Avg: 11.7 µg/m3

Air Quality By Pollutant:

Pollutant
Tuesday
9/29/2020
Wednesday
9/30/2020
Thursday
10/1/2020
Friday
10/2/2020
Saturday
10/3/2020
O3
54
74
80
87
84
PM10
63
58
59
58
50
PM2.5
45
50
51
52
49
Pollutant
TUE
WED
THU
FRI
SAT
O3
54
74
80
87
84
PM10
63
58
59
58
50
PM2.5
45
50
51
52
49
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

If you're out and about this morning, you may notice a haze partially obscuring the mountains. This is because PM10 (dust) levels are elevated around the Valley (as of 7 AM), which is the result of stronger easterly winds over central Arizona. As these easterly winds persist through the morning, so could the elevated PM10 levels. By the afternoon, PM10 levels should improve, but they'll likely increase again at night in industrial areas.

In regards to ozone, ozone accumulation should be delayed this morning as winds help to disperse it. However, as winds weaken later in the afternoon, ozone may have the potential to creep into the Moderate Air Quality Index (AQI) category, especially for western and/or central areas of Phoenix.

After today, ozone will be the primary pollutant of interest as it is expected to increase. High pressure--strong for this time of year--will result in sunny skies and light winds--conditions favorable for ozone formation and accumulation. But how ozone reaches is still somewhat uncertain. We'll watch ozone trends closely for any changes to the forecast.

Also after today, highest PM10 and PM2.5 levels should become more confined to industrial areas, particularly south/southwest of the Phoenix metro. But stagnant morning and evening conditions will allow for elevated PM10 from any local dust-producing activities.

- M. Graves
ADEQ Meteorologist


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Tuesday: Yellow
Wednesday: Yellow

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