What is the air quality in Leiden?

Leiden, Netherlands has an annual US AQI of 58 (Reasonable) and average PM2.5 of 13.3 µg/m³, ranking #1817 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Leiden?

August is typically the cleanest month (AQI 49) and March the most polluted (AQI 67).

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

Global rank	City	Continent	AQI	PM2.5
1817	Leiden, Netherlands	Europe	AQI 58	PM2.5 13.3 µg/m³