London vs Southend-on-Sea: PM2.5 compared

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

Right now

London#546on the 24-hour board of 738, at 18 US AQI (3.3 µg/m³)

Southend-on-Sea#710on the 24-hour board of 738, at 11 US AQI (1.9 µg/m³)

Compare either city with another

London

Side by side with Borehamwood (the nearest), Birmingham (United Kingdom's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).

Southend-on-Sea

Side by side with Hoo (the nearest), 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).