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New Hampshire air quality today

Updated · LIVE · 2 metros tracked

Across the 2 New Hampshire metros we measure, air is worst right now in Manchester at AQI 29 (Good) and cleanest in Nashua at AQI 29.

Every New Hampshire metro we track

#MetroAQIUV nowDominant
1 Manchesterno page yet 29Good 7 PM2.5
2 Nashuano page yet 29Good 7 O3

Sun over New Hampshire today

The strongest UV in New Hampshire today is 7 (High) in Manchester, arriving around 1pm local time. The mildest of the 2 metros we model here peaks at 7 in Nashua.

7 Manchester 1pm7 Nashua 1pm

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

What stands behind these New Hampshire numbers

2 of the 2 metros here report from a named regulatory monitor — Interior Rockingham County, Hillsborough County. The dominant pollutant across New Hampshire today is PM2.5 in some metros, O3 in others.

We track 2 metropolitan areas in New Hampshire, 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 New Hampshire looks wrong the answer is often next door.

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

Updated