What is the air quality in Seixal?

Seixal, Portugal has an annual US AQI of 54 (Reasonable) and average PM2.5 of 11 µg/m³, ranking #1164 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Seixal?

April is typically the cleanest month (AQI 51) and December the most polluted (AQI 59).

Where does Seixal's air quality data come from?

PM2.5: 1998–2026 (satellite 1998–2024, model 2025–2026). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

Seixal, Portugal — Air Quality & Clean City Guide 2026

Seixal Air Quality Data

Global rank	City	Continent	AQI	PM2.5
1164	Seixal, Portugal	Europe	AQI 54	PM2.5 11 µg/m³