Norwich vs Sheringham: PM2.5 compared

Over the last year, Norwich and Sheringham had about the same air: PM2.5 averaged 9.2 and 9.3 µg/m³, on the 131 days both cities were measured. Norwich had the dirtier air on 84 of those days, Sheringham on 44. Norwich was over the WHO's daily guideline of 15 µg/m³ on 19 of them, Sheringham on 19.

Right now

Norwich#639on the 24-hour board of 738, at 14 US AQI (2.6 µg/m³)

Sheringham#295on the 24-hour board of 738, at 34 US AQI (6.2 µg/m³)

The last year, day by day

Norwich

Sheringham

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: Norwich. Faded: Sheringham. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

Year	Norwich	Sheringham	Days both measured	Days Norwich was worse
2026 so far	54	54	82	54
2025	37	39	189	86
2024	39	37	238	175
2023	43	39	176	137

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

Norwich

26 Jan 20269935.0 µg/m³
6 Feb 20269432.1 µg/m³
3 Feb 20268728.4 µg/m³

Sheringham

6 Feb 202610838.2 µg/m³
26 Jan 20269935.0 µg/m³
3 Feb 20269231.1 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

Norwich

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

Sheringham

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

Use this page

SmogRank, PM2.5 daily means compared, Norwich and Sheringham, 8 Oct 2025 – 7 Oct 2026, smogrank.com/compare/gb-norwich/gb-sheringham (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).