What is the air quality in San José?

San José, Costa Rica has an annual US AQI of 63 (Polluted) and average PM2.5 of 15.8 µg/m³, ranking #2557 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in San José?

January is typically the cleanest month (AQI 56) and July the most polluted (AQI 68).

Where does San José's air quality data come from?

PM2.5: 1998–2024 (monitors 2019–2023, satellite 1998–2019, 2023–2024). Measured by government monitoring stations. Full sources are on the methodology page.

San José, Costa Rica — Air Quality & Clean City Guide 2026

San José Air Quality Data

Global rank	City	Continent	AQI	PM2.5
2557	San José, Costa Rica	North America	AQI 63	PM2.5 15.8 µg/m³