Cheltenham vs Gloucester: PM2.5 compared

Cheltenham and Gloucester were both measured on only 8 days over the last year, too few to compare them (it takes 30).

Right now

Cheltenham#288on the 24-hour board of 738, at 35 US AQI (6.3 µg/m³)

Gloucester#560on the 24-hour board of 738, at 18 US AQI (3.2 µg/m³)

Compare either city with another

Cheltenham

Side by side with London (United Kingdom's worst on 30 days), Gujranwala (the world's worst on 30 days).

Gloucester

Side by side with London (United Kingdom'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 2026-10-08 20:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published (why we use them).