Air Quality in Leiden, Netherlands

Windy
16.2°C · 73.5% humidity
16.2°
Feels 16.2°
25
Good
Air quality is satisfactory. Enjoy outdoor activities.
12 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
4 8pm
4
4
25 11pm
26
22
19 2am
17
15
14 5am
13
12
12 8am
12
12
11 11am
11
11
11 2pm
11
11
11 5pm
4
4
Station readings
1
0
26
CAMS model adj -23
27
27
27
27
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
27
27
AD 728×90

Air Quality Index Trend

47h · 8 stn

Leiden's air quality is shaped by traffic emissions and residential heating. Pollution levels tend to peak during winter months when cold air traps emissions close to ground level.

73.5%
Humidity
59.2 km/h
Wind NNW
1014.6 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
PM2.5
25
5.99 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

Temperature & Precipitation

PM2.5 Trend

47h · 8 stations
PM2.55.99 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
5.99
Median
6.15
Average
0.16
Low
9.6
High
PM2.5 µg/m³ · Model: 6.25 · Bias: +0.3
07-21
19.9° 16.3°
0.56 mm
07-22
20.0° 16.2°
1.88 mm
07-23
17.5° 15.5°
1.94 mm
07-24
21.3° 16.9°
4.19 mm
07-25
23.1° 14.8°
0.06 mm
07-26
28.2° 16.5°
0.5 mm
07-27
21.5° 18.5°
0.56 mm
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-07-21T21:28 UTC.