What is the air quality in San Luis Obispo CA?

San Luis Obispo CA, United States of America has an annual US AQI of 39 (Reasonable) and average PM2.5 of 6.8 µg/m³, ranking #228 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in San Luis Obispo CA?

February is typically the cleanest month (AQI 37) and September the most polluted (AQI 45).

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

PM2.5: 1998–2026 (monitors 2011–2026, satellite 1998–2011, 2015–2016, 2024; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

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

San Luis Obispo CA Air Quality Data

Global rank	City	Continent	AQI	PM2.5
228	San Luis Obispo CA, United States of America	North America	AQI 39	PM2.5 6.8 µg/m³