What is the air quality in Leiria?

Leiria, Portugal has an annual US AQI of 49 (Reasonable) and average PM2.5 of 9.5 µg/m³, ranking #671 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Leiria?

June is typically the cleanest month (AQI 45) and January the most polluted (AQI 55).

Where does Leiria's air quality data come from?

PM2.5: 1998–2026 (monitors 2013–2017, 2019–2026, satellite 1998–2012, 2016–2018; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Leiria, Portugal — Air Quality & Clean City Guide 2026

Leiria Air Quality Data

Global rank	City	Continent	AQI	PM2.5
671	Leiria, Portugal	Europe	AQI 49	PM2.5 9.5 µg/m³