What is the air quality trend in Clausthal-Zellerfeld?

Over the past 3 days, Clausthal-Zellerfeld had an average AQI of 26 based on station measurements. The worst day was 2026-07-21 with AQI 28.

How is Clausthal-Zellerfeld air quality measured?

Air quality in Clausthal-Zellerfeld 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 Clausthal-Zellerfeld, Germany

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

Historical PM2.5 and AQI trend from monitoring stations near Clausthal-Zellerfeld, Germany.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

12h

PM2.5 Station

12h · 1 station

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	27	27–27	6.5 µg/m³	1h	1
2026-07-21	28	23–35	6.7 µg/m³	7h	2
2026-07-20	25	23–27	6.0 µg/m³	4h	2

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