Tucson Forecast

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Air Quality Hourly Forecast | Tucson

Click on each day to view forecast.

Tuesday Forecast:


Ozone

67 AQI
Max 8-hr Avg: 60 ppb

PM10

22 AQI
24-hr Avg: 24 µg/m3

PM2.5

31 AQI
24-hr Avg: 7.5 µg/m3

Wednesday Forecast:


Ozone

64 AQI
Max 8-hr Avg: 59 ppb

PM10

24 AQI
24-hr Avg: 26 µg/m3

PM2.5

27 AQI
24-hr Avg: 6.5 µg/m3

Thursday Forecast:


Ozone

58 AQI
Max 8-hr Avg: 57 ppb

PM10

22 AQI
24-hr Avg: 24 µg/m3

PM2.5

28 AQI
24-hr Avg: 6.6 µg/m3

Friday Forecast:


Ozone

54 AQI
Max 8-hr Avg: 56 ppb

PM10

23 AQI
24-hr Avg: 25 µg/m3

PM2.5

27 AQI
24-hr Avg: 6.4 µg/m3

Saturday Forecast:


Ozone

54 AQI
Max 8-hr Avg: 56 ppb

PM10

22 AQI
24-hr Avg: 24 µg/m3

PM2.5

26 AQI
24-hr Avg: 6.2 µg/m3

Air Quality By Pollutant:

Pollutant
Tuesday
7/27/2021
Wednesday
7/28/2021
Thursday
7/29/2021
Friday
7/30/2021
Saturday
7/31/2021
O3
67
64
58
54
54
PM10
22
24
22
23
22
PM2.5
31
27
28
27
26
Pollutant
TUE
WED
THU
FRI
SAT
O3
67
64
58
54
54
PM10
22
24
22
23
22
PM2.5
31
27
28
27
26
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

This morning, a large high pressure pattern is centered over southeastern Wyoming and is the dominant feature over the western half of the continental U.S. This puts Arizona underneath a southeasterly (out of the southeast) flow. At least through Thursday, this flow will be favorable for moving thunderstorms into southeastern Arizona and thus, into or around the Tucson area. Therefore, thunderstorms will be possible each afternoon through Thursday.

Then, similar to last week, though not as significant, another low pressure disturbance from the east will move over the state Friday and Saturday. This wave will help to increase thunderstorm coverage and chances around Arizona toward the end of the week. For Tucson, this means continued daily thunderstorm chances through the weekend.

Air quality-wise, ozone will be the main pollutant of interest this week. Each day, ozone levels are expected to increase under light winds and sunny skies. But also, each day, thunderstorm weather (clouds, winds, and/or rain) is expected to help limit ozone levels in the afternoon. Overall, ozone is forecast in the Moderate Air Quality Index (AQI) category today through at least Saturday.

PM10 (dust) and PM2.5 (smoke) will remain in the Good AQI category. Recent rain--and future rain--should help to keep soils stabilized and reduce the dust threat.

- M. Graves
ADEQ Meteorologist


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Wednesday: Yellow
Thursday: Yellow

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