Bonn vs Niederkassel: PM2.5 compared

Bonn and Niederkassel were both measured on only 0 days over the last year, too few to compare them (it takes 30).

Right now

Bonn–no readings since 11 Oct

Niederkassel#1,839on the 24-hour board of 2,581, at 23 US AQI (4.1 µg/m³)

Compare either city with another

Bonn

Side by side with Königswinter (the nearest), Augsburg (Germany's worst on 30 days), Gujranwala (the world's worst on 30 days).

Niederkassel

Side by side with Augsburg (Germany's worst on 30 days), Gujranwala (the world's worst on 30 days).

The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.

Updated 2026-10-13 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence).