Tucson Forecast

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Air Quality Hourly Forecast | Tucson

Click on each day to view forecast.

Monday Forecast:


Ozone

44 AQI
Max 8-hr Avg: 47 ppb

PM10

25 AQI
24-hr Avg: 27 µg/m3

Tuesday Forecast:


Ozone

45 AQI
Max 8-hr Avg: 49 ppb

PM10

23 AQI
24-hr Avg: 25 µg/m3

Wednesday Forecast:


Ozone

43 AQI
Max 8-hr Avg: 46 ppb

PM10

21 AQI
24-hr Avg: 23 µg/m3

Thursday Forecast:


Ozone

42 AQI
Max 8-hr Avg: 45 ppb

PM10

19 AQI
24-hr Avg: 21 µg/m3

Friday Forecast:


Ozone

41 AQI
Max 8-hr Avg: 44 ppb

PM10

19 AQI
24-hr Avg: 21 µg/m3

Air Quality By Pollutant:

Pollutant
Monday
7/6/2020
Tuesday
7/7/2020
Wednesday
7/8/2020
Thursday
7/9/2020
Friday
7/10/2020
O3
44
45
43
42
41
PM10
25
23
21
19
19
Pollutant
MON
TUE
WED
THU
FRI
O3
44
45
43
42
41
PM10
25
23
21
19
19
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

A battle is happening over the Desert Southwest. The two opponents are Pacific troughing and the Monsoon ridge. Geographically, Arizona has been lying between these two features as both atmospheric features oscillate in strength overhead our state.

The Monsoon ridge had the upper-hand late last week and through Independence Day. That gave way to a hot and humid air mass precipitating thunderstorm development. Now Pacific troughing is winning the day. A drier and relatively cooler air mass precludes thunderstorm formation for all but those living along or south of the International Border. Such conditions maintain into midweek. By late Wednesday the weather pattern evolves to push pent-up monsoon moisture northward across the Arizona-Mexico border. That scenario relies on how fast Pacific troughing retreats northward in latitude. We’ll keep an eye on that.

The good news for air quality in the Tucson area is that being sandwiched between low pressure troughing and high pressure ridging makes for a decent dispersion pattern in the vertical wind profile across the region. When monsoon moisture does return later in the week we then have cloud cover, precipitation, and localized breezy winds to help out.

Hope everyone had a safe and fun holiday weekend. Enjoy the day!


- J. Malloy
ADEQ Meteorologist


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