What is the air quality in San Diego CA?

San Diego CA, United States of America has an annual US AQI of 55 (Reasonable) and average PM2.5 of 11.1 µg/m³, ranking #1282 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in San Diego CA?

February is typically the cleanest month (AQI 50) and October the most polluted (AQI 76).

Where does San Diego CA's air quality data come from?

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

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

San Diego CA Air Quality Data

Global rank	City	Continent	AQI	PM2.5
1282	San Diego CA, United States of America	North America	AQI 55	PM2.5 11.1 µg/m³