Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Monday Forecast:


Ozone

64 AQI
Max 8-hr Avg: 59 ppb

PM10

64 AQI
24-hr Avg: 82 µg/m3

PM2.5

50 AQI
24-hr Avg: 12.0 µg/m3

Tuesday Forecast:


Ozone

46 AQI
Max 8-hr Avg: 50 ppb

PM10

43 AQI
24-hr Avg: 46 µg/m3

PM2.5

36 AQI
24-hr Avg: 8.6 µg/m3

Wednesday Forecast:


Ozone

71 AQI
Max 8-hr Avg: 61 ppb

PM10

58 AQI
24-hr Avg: 70 µg/m3

PM2.5

52 AQI
24-hr Avg: 12.8 µg/m3

Thursday Forecast:


Ozone

77 AQI
Max 8-hr Avg: 63 ppb

PM10

57 AQI
24-hr Avg: 67 µg/m3

PM2.5

53 AQI
24-hr Avg: 13.0 µg/m3

Friday Forecast:


Ozone

80 AQI
Max 8-hr Avg: 64 ppb

PM10

58 AQI
24-hr Avg: 70 µg/m3

PM2.5

54 AQI
24-hr Avg: 13.3 µg/m3

Air Quality By Pollutant:

Pollutant
Monday
9/28/2020
Tuesday
9/29/2020
Wednesday
9/30/2020
Thursday
10/1/2020
Friday
10/2/2020
O3
64
46
71
77
80
PM10
64
43
58
57
58
PM2.5
50
36
52
53
54
Pollutant
MON
TUE
WED
THU
FRI
O3
64
46
71
77
80
PM10
64
43
58
57
58
PM2.5
50
36
52
53
54
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Unseasonably strong high pressure will establish itself over the West this week. As a result, weather conditions in Phoenix will be sunny and warm each day. High temperatures are forecast to be 5-10°F above normal, peaking near the end of the work week. Winds will also be mostly light; the main exception will be Tuesday: breezy winds out of the east (10-15 mph) are expected in the morning, weakening in the afternoon.

Air quality-wise, this time of year, the average ozone Air Quality Index (AQI) value is in the lower end of the Moderate AQI category. This is because of shortening day lengths (ozone needs sunlight to form). However, considering how high last week's ozone levels reached--and this week's high pressure--we may not completely be out of the water yet. For now, ozone is forecast, at most, in the mid-upper range of the Moderate AQI category. But the winds on Tuesday will help to limit ozone levels as well.

In regards to particulate matter, morning stagnant conditions will be favorable for the local build-up of PM10 (dust) and PM2.5 (smoke), particularly in/around industrial areas south of the Phoenix metro. Such is the case this morning, in fact. However, Tuesday morning will be the outlier, as breezy winds should help to limit particulate matter levels.

- M. Graves
ADEQ Meteorologist


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Wednesday: Yellow

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