Worst air pollution Catalina Foothills, today and tomorrow
Today (20 September): Air quality in Catalina Foothills is moderate. AQI and PM10 are moderate; PM2.5 is fair; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (PM10: 53.9/100).
Tomorrow (21 September 2026): Air quality in Catalina Foothills is moderate. O3 increases to fair; all other pollutants stay as today. Pollution peaks around 10:00 AM (PM10: 44.9/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Catalina Foothills' air quality reflects the Sonoran Desert basin south of Tucson at 800 metres elevation in the Santa Catalina Mountain foothills, with vehicle emissions from Oracle Road and Campbell Avenue the primary local sources. The elevated foothills position provides better dispersal than the flat Tucson valley floor, while windblown desert dust contributes PM10 and summer monsoon ozone from vehicle and desert landscape emissions are the primary seasonal air quality concerns throughout the year.
Today - 20 September | Pollution peaks at 10:00
AQI:
Moderate
53.9/100
PM2.5 (fine particles):
Fair
34.8/100
PM10 (coarse particles):
Moderate
53.9/100
NO2 (nitrogen dioxide):
Good
6.8/100
O3 (ozone):
Good
18.8/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.2/100
PM1 (ultrafine particles):
Good
2.8/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 10:00
AQI:
Moderate
44.9/100
PM2.5 (fine particles):
Fair
24.3/100
PM10 (coarse particles):
Moderate
44.9/100
NO2 (nitrogen dioxide):
Good
4.1/100
O3 (ozone):
Fair
22.9/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.0/100
PM1 (ultrafine particles):
Good
2.3/100
Pollen forecast in Catalina Foothills
View pollen forecastFrequently Asked Questions
Is air quality bad in Catalina Foothills right now?
On 20 September 2026, overall air quality in Catalina Foothills is moderate. AQI is the main air quality indicator at 53.9/100. Pollution peaks around 10:00 AM (PM10: 53.9/100).
Will air quality be worse tomorrow in Catalina Foothills?
On 21 September 2026, air quality conditions in Catalina Foothills will be similar to today, with AQI forecast at moderate at 44.9/100. Pollution peaks around 10:00 AM (PM10: 44.9/100).
When is air pollution at its worst in Catalina Foothills?
Catalina Foothills follows a fairly predictable seasonal air quality pattern. In short, winter is generally the cleanest season, with cooler temperatures and less dust in the air, whereas spring dust storms and summer ozone together make March through September the toughest stretch. Sudden haboob-style dust storms can appear with little warning during the spring wind season.
Are air quality levels in Catalina Foothills 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 20 September 2026 at 14:33 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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