SmogRank / United Kingdom / England / Sheffield
Sheffield, month by month
Sheffield has a measured daily mean on 1,125 days since 1 January 2023. Its worst month was March 2025, at 62 US AQI (15.1 µg/m³), 1,029th of 3,102 cities on that month's world ranking. Its cleanest was August 2023, at 23 US AQI (4.2 µg/m³). 2025 averaged 48 US AQI (8.7 µg/m³), against 40 US AQI (7.2 µg/m³) in 2024.
Every month since 2023
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Months without a mean, and why
11 months
| Month | Why |
|---|---|
| Jul 2026 | 21 of 31 days measured; a month needs 22. The others: 9 with no readings from the monitors, 1 with readings for part of the day (a day needs 18 hours). |
| Dec 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Nov 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Apr 2024 | 19 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Oct 2023 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 19 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 11 with under 18 hours of readings or readings that failed our checks. |
| Jun 2023 | 17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| May 2023 | 18 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Apr 2023 | 18 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive, 9 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 10 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 1 with under 18 hours of readings or readings that failed our checks. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Sheffield's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| March 2025 | 6215.1 µg/m³ | 1,029thof 3,102 | – |
| February 2025 | 6114.2 µg/m³ | 1,011thof 2,852 | – |
| March 2026 | 5511.5 µg/m³ | 1,498thof 3,285 | Europe, 18 to 25 March 2026 Europe, 1 to 12 March 2026 |
| January 2025 | 5511.4 µg/m³ | 962ndof 2,754 | – |
| May 2024 | 5310.0 µg/m³ | 755thof 2,684 | – |
| April 2025 | 529.7 µg/m³ | 1,339thof 3,145 | – |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Sheffield's worst days
| Day | US AQI | Episode |
|---|---|---|
| 9 Mar 2025 | 12444.9 µg/m³ | – |
| 10 Mar 2025 | 11440.6 µg/m³ | – |
| 19 Feb 2025 | 10035.4 µg/m³ | – |
| 21 Mar 2025 | 9733.6 µg/m³ | – |
| 15 Feb 2023 | 9633.3 µg/m³ | Europe, 6 to 25 February 2023 |
| 14 Feb 2023 | 9432.3 µg/m³ | Europe, 6 to 25 February 2023 |
| 21 Mar 2026 | 9432.1 µg/m³ | Europe, 18 to 25 March 2026 |
| 5 Mar 2026 | 9231.2 µg/m³ | Europe, 1 to 12 March 2026 |
| 22 Mar 2026 | 9130.6 µg/m³ | Europe, 18 to 25 March 2026 |
| 9 Feb 2025 | 9130.5 µg/m³ | – |
Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Sheffield, United Kingdom, 1 Jan 2023 – 12 Oct 2026. Monitor data from UK-AIR (Defra), read from the publisher; sources listed at smogrank.com/sources. smogrank.com/gb/sheffield/history (accessed 13 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.
Sheffield now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 21:07 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). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).