Air quality · PM2.5good
8.1 µg/m³
The available annual series averages 1.6× the WHO annual guideline of 5 µg/m³. The daily average exceeded 15 µg/m³ on 27 days.
The recent period is 4% lower than the preceding period.
Leiden
Zuid-Holland127.089 residents23,2 km²
108
sensors, 4,6/km²
Public summary
What the measurements in Leiden show
The citizen sensor network in Leiden, Zuid-Holland, contains 108 sensors: an average of 4.6 per km². Projects including Luftdaten and Palmes contribute measurements to this public network.
Noiserustig
40.0 dB(A) nacht
The noise series is based on 4 sensors. The daytime average exceeded 55 dB on 0 of 309 measured days.
Building the report for Leiden…
We're reading the citizen sensors and making sense of the figures.
did you know?Particulate matter (PM2.5) is roughly 30× thinner than a human hair. Small enough to reach deep into your lungs.
