Montana air quality today

Every Montana metro we track

Sun over Montana today

The strongest UV in Montana today is 7.4 (High) in Billings, arriving around 1pm local time. The mildest of the 2 metros we model here peaks at 6 in Missoula.

UV is modelled, not measured — unlike the AQI above it, which comes off an instrument. How we handle UV →

What stands behind these Montana numbers

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

We track 2 metropolitan areas in Montana, not the whole state, and none of them has its own page yet — a metro page ships only after thirty days of our own history, and that clock is running. 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 Montana looks wrong the answer is often next door.