Worst air pollution Flagstaff, today and tomorrow
Today (15 July): Air quality in Flagstaff is fair. PM2.5, PM10, and NO2 are fair; AQI and O3 are medium; SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (O3: 42.7/100).
Tomorrow (16 July 2026): Air quality in Flagstaff is fair. PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 AM (O3: 41.4/100). 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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Flagstaff's air quality benefits from its elevated Colorado Plateau position at 2,106 metres, with clean Rocky Mountain and Colorado Plateau airflows providing generally excellent ventilation across this northern Arizona university city. Vehicle emissions from I-40 and US-89 are the primary local sources, while summer wildfire smoke from Arizona and New Mexico forests is an increasingly severe seasonal concern and winter wood-burning stoves contribute localised PM2.5 during cold nights.
Today - 15 July | Pollution peaks at 11:00
AQI:
Medium
42.7/100
PM2.5 (fine particles):
Fair
23.1/100
PM10 (coarse particles):
Fair
28.8/100
NO2 (nitrogen dioxide):
Fair
31.2/100
O3 (ozone):
Medium
42.7/100
SO2 (sulfur dioxide):
Good
6.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Good
12.1/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 11:00
AQI:
Medium
41.4/100
PM2.5 (fine particles):
Fair
23.9/100
PM10 (coarse particles):
Fair
25.2/100
NO2 (nitrogen dioxide):
Fair
36.9/100
O3 (ozone):
Medium
41.4/100
SO2 (sulfur dioxide):
Good
9.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Fair
21.2/100
Pollen forecast in Flagstaff
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Flagstaff
Frequently Asked Questions
Is air quality bad in Flagstaff right now?
On 15 July 2026, overall air quality in Flagstaff is fair. NO2 is the main pollutant at 31.2/100. Pollution peaks around 11:00 AM (O3: 42.7/100).
Will air quality be worse tomorrow in Flagstaff?
On 16 July 2026, air quality conditions in Flagstaff will be similar to today, with NO2 forecast at fair at 36.9/100. Pollution peaks around 11:00 AM (O3: 41.4/100).
When is air pollution at its worst in Flagstaff?
Seasonal changes shape air quality across Flagstaff: winter is generally the cleanest season, with cooler temperatures and less dust in the air, but spring dust storms and summer ozone together make March through September the toughest stretch. 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 Flagstaff 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