What is the air quality in Trieste?

Trieste, Italy has an annual US AQI of 61 (Polluted) and average PM2.5 of 13.8 µg/m³, ranking #2197 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Trieste?

May is typically the cleanest month (AQI 52) and January the most polluted (AQI 71).

Where does Trieste's air quality data come from?

PM2.5: 1998–2026 (monitors 2018–2026, satellite 1998–2017, model 2026; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Trieste, Italy — Air Quality & Clean City Guide 2026

Trieste Air Quality Data

Global rank	City	Continent	AQI	PM2.5
2197	Trieste, Italy	Europe	AQI 61	PM2.5 13.8 µg/m³