What is the air quality in Napa CA?

Napa CA, United States of America has an annual US AQI of 47 (Reasonable) and average PM2.5 of 9.4 µg/m³, ranking #584 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Napa CA?

April is typically the cleanest month (AQI 41) and January the most polluted (AQI 58).

Where does Napa CA's air quality data come from?

PM2.5: 1998–2024 (monitors 2007–2010, 2012–2021, satellite 1998–2006, 2011–2012, 2021–2024). Measured by government monitoring stations. Full sources are on the methodology page.

Napa CA, United States of America — Air Quality & Clean City Guide 2026

Napa CA Air Quality Data

Global rank	City	Continent	AQI	PM2.5
584	Napa CA, United States of America	North America	AQI 47	PM2.5 9.4 µg/m³