Gillingham vs London: PM2.5 compared

Over the last year, London's air was 23% more polluted than Gillingham's: PM2.5 averaged 9.6 µg/m³ against 7.8, on the 135 days both cities were measured. London had the dirtier air on 110 of those days, Gillingham on 24. London was over the WHO's daily guideline of 15 µg/m³ on 14 of them, Gillingham on 10.

Right now

Gillingham#570on the 24-hour board of 738, at 17 US AQI (3.1 µg/m³)

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

The last year, day by day

Gillingham

London

Each city's daily mean from 8 Oct 2025 to 7 Oct 2026, one stripe a day, coloured by band. A blank stripe is a day without a daily mean.

Month by month

Monthly means in µg/m³ over the days both cities were measured. Solid: Gillingham. Faded: London. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

Year	Gillingham	London	Days both measured	Days Gillingham was worse
2026 so far	48	54	81	16
2025	36	49	204	21
2024	35	46	240	44
2023	28	43	144	8

Means in US AQI over the days both cities were measured that year; a year shows once they share 30 such days.

Each city's worst days

Gillingham

9 Mar 20269331.5 µg/m³
5 Mar 20268728.3 µg/m³
26 Jan 20268628.0 µg/m³

London

26 Jan 202610838.5 µg/m³
9 Mar 20269231.2 µg/m³
8 Mar 20268426.9 µg/m³

Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.

Compare either city with another

Gillingham

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

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).

Use this page

SmogRank, PM2.5 daily means compared, Gillingham and London, 8 Oct 2025 – 7 Oct 2026, smogrank.com/compare/gb-gillingham/gb-london (accessed 8 Oct 2026).

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

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).