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Arizona air quality today

Updated · LIVE · 2 metros tracked

Across the 2 Arizona metros we measure, air is worst right now in Phoenix at AQI 45 (Good) and cleanest in Tucson at AQI 35.

Every Arizona metro we track

#MetroAQIUV nowDominant
1 Phoenix 45Good 4.1 PM2.5
2 Tucson 35Good 4.6 O3

Sun over Arizona today

The strongest UV in Arizona today is 10.9 (Extreme) in Tucson, arriving around 12pm local time. The mildest of the 2 metros we model here peaks at 8.7 in Phoenix.

10.9 Tucson 12pm8.7 Phoenix 12pm

UV is modelled, not measured — unlike the AQI above it, which comes off an instrument. Hour by hour in Phoenix →

What stands behind these Arizona numbers

2 of the 2 metros here report from a named regulatory monitor — Phoenix, Tucson. The dominant pollutant across Arizona today is PM2.5 in some metros, O3 in others.

We track 2 metropolitan areas in Arizona, not the whole state, and 2 of them have a page of its own. There is no state-wide average here on purpose: averaging 2 metros into one figure would invent a value for all the ground between them. How we measure, and what we refuse to estimate →

Neighbouring states

Smoke and inversions do not stop at a state line, so when Arizona looks wrong the answer is often next door.

CaliforniaColoradoNevadaNew MexicoUtah
Worst air in the US right nowHow Arizona compares against every metro we track What the number meansEPA bands, and where “unhealthy for everyone” starts

Updated