Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Monday Forecast:

Alert: Ozone Health Watch in effect for Monday

Ozone

97 AQI
Max 8-hr Avg: 69 ppb

PM10

51 AQI
24-hr Avg: 56 µg/m3

PM2.5

40 AQI
24-hr Avg: 9.5 µg/m3

Tuesday Forecast:

Alert: Ozone Health Watch in effect for Tuesday

Ozone

93 AQI
Max 8-hr Avg: 68 ppb

PM10

51 AQI
24-hr Avg: 55 µg/m3

PM2.5

37 AQI
24-hr Avg: 8.8 µg/m3

Wednesday Forecast:


Ozone

84 AQI
Max 8-hr Avg: 65 ppb

PM10

51 AQI
24-hr Avg: 55 µg/m3

PM2.5

35 AQI
24-hr Avg: 8.3 µg/m3

Thursday Forecast:


Ozone

80 AQI
Max 8-hr Avg: 64 ppb

PM10

48 AQI
24-hr Avg: 52 µg/m3

PM2.5

33 AQI
24-hr Avg: 8.0 µg/m3

Friday Forecast:


Ozone

84 AQI
Max 8-hr Avg: 65 ppb

PM10

49 AQI
24-hr Avg: 53 µg/m3

PM2.5

34 AQI
24-hr Avg: 8.2 µg/m3

Air Quality By Pollutant:

Pollutant
Monday
3/25/2019
Tuesday
3/26/2019
Wednesday
3/27/2019
Thursday
3/28/2019
Friday
3/29/2019
O3
97
93
84
80
84
PM10
51
51
51
48
49
PM2.5
40
37
35
33
34
Pollutant
MON
TUE
WED
THU
FRI
O3
97
93
84
80
84
PM10
51
51
51
48
49
PM2.5
40
37
35
33
34
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Ozone appears to be finally out of the gate and running. Yesterday, every ozone monitor around the Valley--save for the one in South Scottsdale--saw ozone Air Quality Index (AQI) levels reach the Moderate category, with four of those monitors seeing AQI levels of at least 80. And today, ozone levels are only expected to increase; sunny skies and light wind conditions will be favorable for ozone accumulation. As a result, the ozone forecast for today has been increased into Health Watch criteria.

On Tuesday, similar weather conditions as today are expected, but there also looks to a little more cloud cover. Though extra cloud cover might help to reduce local production of ozone in the Valley, ozone in the higher elevations north and northeast of the Valley will likely stick around. Therefore, we'll raise the ozone forecast into Health Watch criteria for tomorrow as well.

Fortunately, thicker cloud cover is expected on Wednesday and better winds are expected on Thursday, so ozone levels are forecast to decrease mid-week. We'll continue to watch ozone trends closely.

No issues with PM10 (dust) are expected this week, save for the potential for locally elevated levels southwest of the Phoenix metro area. These areas of the Valley may see PM10 crest into the low Moderate AQI category. PM2.5 will remain in the Good AQI category.

- M. Graves
ADEQ Meteorologist


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