What is the air quality in Koper?

Koper, Slovenia has an annual US AQI of 63 (Polluted) and average PM2.5 of 14 µg/m³, ranking #2465 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Koper?

September is typically the cleanest month (AQI 52) and January the most polluted (AQI 74).

Where does Koper's air quality data come from?

PM2.5: 1998–2026 (monitors 2022–2026, satellite 1998–2021; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Koper, Slovenia — Air Quality & Clean City Guide 2026

Koper Air Quality Data

Global rank	City	Continent	AQI	PM2.5
2465	Koper, Slovenia	Europe	AQI 63	PM2.5 14 µg/m³