Worst air pollution Fourth Avenue - Tucson, today and tomorrow
Today (15 July): Air quality in Fourth Avenue is fair. AQI, PM2.5, PM10, and O3 are fair; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 AM (PM10: 38.4/100).
Tomorrow (16 July 2026): Air quality in Fourth Avenue is fair. PM2.5 decreases to good; all other pollutants stay as today. Pollution peaks around 9:00 AM (O3: 27.5/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Tucson's Fourth Avenue air quality reflects the historic arts and entertainment corridor, with vehicle traffic on 4th Avenue and the surrounding dense mixed residential and commercial character contributing local sources. The Sonoran Desert basin position creates temperature inversion episodes under calm conditions, while the neighbourhood's walkable character and the consistent Tucson afternoon winds generally maintain moderate Tucson metropolitan readings throughout most of the year.
Today - 15 July | Pollution peaks at 07:00
AQI:
Fair
38.4/100
PM2.5 (fine particles):
Fair
24.7/100
PM10 (coarse particles):
Fair
38.4/100
NO2 (nitrogen dioxide):
Good
1.3/100
O3 (ozone):
Fair
27.1/100
SO2 (sulfur dioxide):
Good
4.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
4.6/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 09:00
AQI:
Fair
27.5/100
PM2.5 (fine particles):
Good
15.1/100
PM10 (coarse particles):
Fair
23.3/100
NO2 (nitrogen dioxide):
Good
1.8/100
O3 (ozone):
Fair
27.5/100
SO2 (sulfur dioxide):
Good
5.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
3.6/100
Other Landmarks in Tucson
Sports venues in Tucson
Frequently Asked Questions
Is air quality bad in Fourth Avenue right now?
On 15 July 2026, overall air quality in Fourth Avenue is fair. AQI is the main air quality indicator at 38.4/100. Pollution peaks around 7:00 AM (PM10: 38.4/100).
Will air quality be worse tomorrow in Fourth Avenue?
On 16 July 2026, air quality conditions in Fourth Avenue will be similar to today, with AQI forecast at fair at 27.5/100. Pollution peaks around 9:00 AM (O3: 27.5/100).
When is air pollution at its worst in Fourth Avenue?
At Fourth Avenue, air quality tends to follow Tucson's broader seasonal rhythm — the cooler winter months typically bring the cleanest air of the year, whereas intense summer heat combines with occasional dust events to create the year's worst episodes. Monsoon storms in July and August can either clear the air with rain or stir up dust ahead of the storm front.
Are air quality levels in Fourth Avenue based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app