What is the air quality in Johnstown PA?

Johnstown PA, United States of America has an annual US AQI of 55 (Reasonable) and average PM2.5 of 11.9 µg/m³, ranking #1355 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Johnstown PA?

October is typically the cleanest month (AQI 47) and July the most polluted (AQI 64).

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

PM2.5: 1998–2026 (monitors 1999–2026, satellite 1998–2001, 2003–2004, 2006–2007; 2026 provisional (AirNow)). Measured by government monitoring stations. Full sources are on the methodology page.

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

Johnstown PA Air Quality Data

Global rank	City	Continent	AQI	PM2.5
1355	Johnstown PA, United States of America	North America	AQI 55	PM2.5 11.9 µg/m³