Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Monday Forecast:


Ozone

77 AQI
Max 8-hr Avg: 63 ppb

PM10

54 AQI
24-hr Avg: 62 µg/m3

PM2.5

33 AQI
24-hr Avg: 8.0 µg/m3

Tuesday Forecast:

Alert: Ozone Health Watch in effect for Tuesday

Ozone

93 AQI
Max 8-hr Avg: 68 ppb

PM10

53 AQI
24-hr Avg: 59 µg/m3

PM2.5

31 AQI
24-hr Avg: 7.5 µg/m3

Wednesday Forecast:

Alert: Ozone High Pollution Advisory possible on Wednesday

Ozone

101 AQI
Max 8-hr Avg: 71 ppb

PM10

54 AQI
24-hr Avg: 62 µg/m3

PM2.5

32 AQI
24-hr Avg: 7.6 µg/m3

Thursday Forecast:


Ozone

77 AQI
Max 8-hr Avg: 63 ppb

PM10

53 AQI
24-hr Avg: 59 µg/m3

PM2.5

30 AQI
24-hr Avg: 7.2 µg/m3

Friday Forecast:


Ozone

71 AQI
Max 8-hr Avg: 61 ppb

PM10

52 AQI
24-hr Avg: 57 µg/m3

PM2.5

29 AQI
24-hr Avg: 7.0 µg/m3

Air Quality By Pollutant:

Pollutant
Monday
6/17/2019
Tuesday
6/18/2019
Wednesday
6/19/2019
Thursday
6/20/2019
Friday
6/21/2019
O3
77
93
101
77
71
PM10
54
53
54
53
52
PM2.5
33
31
32
30
29
Pollutant
MON
TUE
WED
THU
FRI
O3
77
93
101
77
71
PM10
54
53
54
53
52
PM2.5
33
31
32
30
29
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Ozone will be the main focus for this Phoenix air quality forecast. Monday through Wednesday, ozone is forecast to gradually increase each day as atmospheric conditions become more stagnant (i.e. less dispersion to mix out ozone). Of course, this is because of higher pressure slowly developing over the region. Currently, an Ozone Health Watch has been issued for tomorrow (Tuesday) and an Ozone High Pollution Advisory (HPA) is possible on Wednesday.

Then by Thursday, winds are forecast to pick up out of the southwest as a large low pressure pattern begins to move over the Northwest U.S. Winds currently look to be even stronger on Friday. Because of these winds, ozone levels are forecast to decrease Thursday and Friday.

One unusual wildcard to note is the Woodbury wildfire that is active in the Supersition Mountains. This past Friday, smoke from that wildfire caused ozone levels to shoot up at the Tonto National Monument monitor next to Roosevelt Lake. We'll be watching ozone trends at this monitor this week to see if smoke affects ozone there again.

Regarding particulate matter, PM10 (dust) is forecast in the Moderate Air Quality Index (AQI) category each day this week because of expected dust-producing activities southwest of the Phoenix metro area. But PM10 should remain in the Good AQI category elsewhere around the Valley.

- M. Graves
ADEQ Meteorologist


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