What is the air quality in Porto?

Porto, Portugal has an annual US AQI of 50 (Reasonable) and average PM2.5 of 9.8 µg/m³, ranking #745 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Porto?

July is typically the cleanest month (AQI 43) and January the most polluted (AQI 57).

Where does Porto's air quality data come from?

PM2.5: 1998–2026 (monitors 2009–2016, 2018–2019, 2021–2026, satellite 1998–2009, 2013–2024; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Porto, Portugal — Air Quality & Clean City Guide 2026

Porto Air Quality Data

Global rank	City	Continent	AQI	PM2.5
745	Porto, Portugal	Europe	AQI 50	PM2.5 9.8 µg/m³