Air Quality by State (2022–2024)
Freedom#54 of 88 · Added July 22, 2026At 5.0 micrograms per cubic meter, New Hampshire has the cleanest air east of the Mississippi and sits right at the WHO guideline. Pennsylvania breathes twice as heavy.
At 5.0 micrograms per cubic meter, New Hampshire has the cleanest air east of the Mississippi and sits right at the WHO guideline. Pennsylvania breathes twice as heavy.
