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Arizona Air Quality

Grand Canyon National Park is the worst air in Arizona right now at an index of 58, which is Moderate, from ground-level ozone. AirNow carries 15 reporting areas in the state. No air quality alert is in force.

Reporting areas: 15
Worst index now: 58
Alerts in force: 0
Towns under smoke: 0

Fine particles on the map

Forecast fine particulate matter from NOAA’s National Air Quality Forecast Capability over Arizona. Open it for the live map, where it pans and zooms.

Open the live map with the particulate forecast

Map layer from NOAA National Air Quality Forecast Capability. Boundaries from the Iowa Environmental Mesonet.

Alerts in force

An Air Quality Alert is issued by the National Weather Service on behalf of a state or local agency when pollution is expected to reach a level that harms health. An Air Stagnation Advisory means the air will not move enough to clear what is already in it.

None are in force in Arizona right now. All Arizona warnings.

By city, now and the days ahead15

Every AirNow reporting area in Arizona: what its monitors measured this hour, and what the state or local agency that forecasts for it expects today and tomorrow. Each area links to the nearest town’s page.

Reporting area	Now	Category now	Today	Tomorrow	Pollutant
Grand Canyon National Park	58	Moderate	Not forecast	Not forecast	Ozone
Phoenix	37	Good	Moderate	Moderate	Ozone
Yuma	34	Good	Good	Good	PM2.5
McDowell	33	Good	Not forecast	Not forecast	Ozone
Tucson	32	Good	Good	Good	PM2.5
Flagstaff	31	Good	Good	Good	Ozone
Nogales	31	Good	Good	Good	PM2.5
Prescott	31	Good	Good	Good	Ozone
Douglas	28	Good	Good	Good	PM10
Gila River Indian Community	27	Good	Not forecast	Not forecast	PM10
Salt River Pima-Maricopa Indian Community	27	Good	Not forecast	Not forecast	Ozone
West Pinal	27	Good	Good	Good	PM10
Hayden	17	Good	Good	Good	PM10
Miami	15	Good	Good	Good	PM10
Rillito	10	Good	Good	Good	PM10

The forecaster’s discussion

Written by Arizona Department of Environmental Quality for Phoenix and filed with AirNow.

Clear skies are the highlight of the morning. With the next area of low pressure moving in today, the forecast holds daily ozone in the Good AQI category for one more day. After, enough sunshine is expected into the weekend to bump daily ozone levels to the Moderate AQI category. Daily ozone levels Monday could also reach the lower Moderate AQI category, although it is forecast to be on the downtrend as low pressure is forecast and will also bring more cloud cover. Daily ozone on Tuesday is forecast to be in the Good AQI range.

For PM10, the main factors in recent days (thunderstorms and outflow winds) are at bay. Overall, PM10 is forecast to be in the Good AQI category the next several days. The typical short-lived increases (mainly in the mornings) from industrial and construction activity is expected, especially in western Phoenix. PM2.5 will hold similar trends.

A. Hermansen

Last Update: Friday, September 18, 2026, 9:17 AM

Smoke

NOAA’s analysts have not drawn wildfire smoke over any town in Arizona today.

Smoke on the radar over Arizona

What this means

The index runs from 0 to 500. Good is 0 to 50, Moderate to 100, Unhealthy for Sensitive Groups to 150, Unhealthy to 200, Very Unhealthy to 300, and Hazardous above that. The figure reported for a place is the highest index among the pollutants measured there, and the pollutant that produced it is named beside it.

What these numbers are. An index beside a monitor’s name is a measurement, published hourly by AirNow and preliminary until the operating agency certifies it. A category for today or tomorrow is a state or local agency forecaster’s own forecast for a reporting area. An hourly index is NOAA’s air quality model on a five-kilometer grid, not a reading from any instrument. Where a town has no monitor within reach, only the model figures appear, and the page says so.

Towns

Air quality for any town in Arizona: what is measured nearby, the category forecast for today and tomorrow, and NOAA’s model hour by hour. Largest first.

13 smaller towns

Smaller places have pages too; search for one on the air quality landing page.

Sources

Observations and daily forecasts from AirNow, the US Environmental Protection Agency’s program with NOAA, the National Park Service, NASA, tribal, state and local agencies. Hourly forecasts from NOAA’s National Air Quality Forecast Capability. Smoke analysis from NOAA’s Hazard Mapping System. Alerts from the National Weather Service. Index categories and breakpoints are EPA’s, as revised in 2024.