What is the air quality in Williamsport PA?

Williamsport PA, United States of America has an annual US AQI of 50 (Reasonable) and average PM2.5 of 10 µg/m³, ranking #769 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Williamsport PA?

October is typically the cleanest month (AQI 41) and July the most polluted (AQI 59).

Where does Williamsport PA's air quality data come from?

PM2.5: 1998–2024 (satellite). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

Williamsport PA, United States of America — Air Quality & Clean City Guide 2026

Williamsport PA Air Quality Data

Global rank	City	Continent	AQI	PM2.5
769	Williamsport PA, United States of America	North America	AQI 50	PM2.5 10 µg/m³