BreatheCheck Get alerts

Pennsylvania air quality today

Updated · LIVE · 2 metros tracked

Across the 2 Pennsylvania metros we measure, air is worst right now in Philadelphia at AQI 52 (Moderate) and cleanest in Pittsburgh at AQI 45.

Every Pennsylvania metro we track

#MetroAQIUV nowDominant
1 Philadelphiano page yet 52Moderate 1.7 PM2.5
2 Pittsburgh 45Good 5 PM2.5

Sun over Pennsylvania today

The strongest UV in Pennsylvania today is 5 (Moderate) in Pittsburgh, arriving around 1pm local time. The mildest of the 2 metros we model here peaks at 3 in Philadelphia.

5 Pittsburgh 1pm3 Philadelphia 12pm

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

What stands behind these Pennsylvania numbers

2 of the 2 metros here report from a named regulatory monitor — Pittsburgh, Philadelphia. The dominant pollutant across Pennsylvania today is PM2.5.

We track 2 metropolitan areas in Pennsylvania, not the whole state, and 1 of them has 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 Pennsylvania looks wrong the answer is often next door.

DelawareMarylandNew JerseyOhioWest Virginia
Worst air in the US right nowHow Pennsylvania compares against every metro we track What the number meansEPA bands, and where “unhealthy for everyone” starts

Updated