What is the air quality trend in Leiden?

Over the past 3 days, Leiden had an average AQI of 27 based on station measurements. The worst day was 2026-05-29 with AQI 58.

How is Leiden air quality measured?

Air quality in Leiden is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Leiden, Netherlands

Name: Leiden Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Leiden, Netherlands.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

45h

PM2.5 Station

45h · 2 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-29	58	6–117	18.4 µg/m³	21.7	22h	3
2026-05-28	8	1–21	1.8 µg/m³	2.9	22h	3
2026-05-27	16	16–16	3.9 µg/m³	6.1	1h	3

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