What is the air quality in La Unión (Costa Rica)?

La Unión (Costa Rica), Costa Rica has an annual US AQI of 62 (Polluted) and average PM2.5 of 15 µg/m³, ranking #2372 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in La Unión (Costa Rica)?

January is typically the cleanest month (AQI 57) and April the most polluted (AQI 66).

Where does La Unión (Costa Rica)'s air quality data come from?

PM2.5: 1998–2024 (satellite). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

La Unión (Costa Rica), Costa Rica — Air Quality & Clean City Guide 2026

La Unión (Costa Rica) Air Quality Data

Global rank	City	Continent	AQI	PM2.5
2372	La Unión (Costa Rica), Costa Rica	North America	AQI 62	PM2.5 15 µg/m³