Tucson Forecast

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Air Quality Hourly Forecast | Tucson

Click on each day to view forecast.

Friday Forecast:


Ozone

74 AQI
Max 8-hr Avg: 62 ppb

PM10

18 AQI
24-hr Avg: 19 µg/m3

PM2.5

21 AQI
24-hr Avg: 5.1 µg/m3

Saturday Forecast:


Ozone

80 AQI
Max 8-hr Avg: 64 ppb

PM10

20 AQI
24-hr Avg: 22 µg/m3

PM2.5

23 AQI
24-hr Avg: 5.5 µg/m3

Sunday Forecast:


Ozone

77 AQI
Max 8-hr Avg: 63 ppb

PM10

21 AQI
24-hr Avg: 23 µg/m3

PM2.5

24 AQI
24-hr Avg: 5.7 µg/m3

Monday Forecast:


Ozone

80 AQI
Max 8-hr Avg: 64 ppb

PM10

23 AQI
24-hr Avg: 25 µg/m3

PM2.5

26 AQI
24-hr Avg: 6.3 µg/m3

Tuesday Forecast:


Ozone

77 AQI
Max 8-hr Avg: 63 ppb

PM10

24 AQI
24-hr Avg: 26 µg/m3

PM2.5

27 AQI
24-hr Avg: 6.4 µg/m3

Air Quality By Pollutant:

Pollutant
Friday
7/30/2021
Saturday
7/31/2021
Sunday
8/1/2021
Monday
8/2/2021
Tuesday
8/3/2021
O3
74
80
77
80
77
PM10
18
20
21
23
24
PM2.5
21
23
24
26
27
Pollutant
FRI
SAT
SUN
MON
TUE
O3
74
80
77
80
77
PM10
18
20
21
23
24
PM2.5
21
23
24
26
27
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Lately, it has seemed that if you give ozone an inch, it will take advantage of it. Yesterday afternoon (Thursday), when skies cleared after the morning clouds/drizzle, ozone levels increased faster than anticipated. Though ozone eventually fell back down in the evening, it easily managed to end up in the Moderate Air Quality Index (AQI) category at multiple monitors in the Tucson area.

For this air quality forecast, ozone will be the main pollutant of interest.

This morning (Friday), the broad monsoonal high pressure is still centered over the Great Plains. Its center will then shift to the Mountain West tomorrow and Sunday. During these days, afternoon thunderstorm chances will continue to be in the forecast for Tucson. But not before ozone has time to increase under sunny skies earlier in the day. Ozone will thus have the potential to reach the Moderate AQI category each day.

Then by Monday, the monsoonal high pressure's center will shift to the AZ/CA border. Though this will alter the direction in which thunderstorms move, we can't rule out thunderstorms still affecting Tucson in the afternoon or evening. Nevertheless, ozone will continue to have the potential to reach the Moderate AQI category.

Regarding particulate matter, recent rain will help to limit PM10 (dust) and PM2.5 (smoke) levels.

- M. Graves
ADEQ Meteorologist


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Saturday: Yellow
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