SmogRank / United Kingdom / England / Dartford
Dartford, month by month
Dartford has a measured daily mean on 890 days since 7 September 2023. Its worst month was January 2025, at 58 US AQI (12.7 µg/m³), 652nd of 2,474 cities on that month's world ranking. Its cleanest was June 2026, at 23 US AQI (4.2 µg/m³).
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
8 months
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 12 with no readings from the monitor. |
| Sep 2026 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2026 | 13 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| May 2025 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Apr 2025 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Mar 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Dartford's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2025 | 5812.7 µg/m³ | 652ndof 2,474 | Western Europe, January 2025 |
| November 2024 | 5712.1 µg/m³ | 565thof 2,624 | Europe, November 2024 |
| March 2026 | 5611.7 µg/m³ | 1,272ndof 2,971 | Europe, 18 to 25 March 2026 Europe, 1 to 12 March 2026 |
| March 2024 | 5410.8 µg/m³ | 315thof 1,698 | United Kingdom and The Netherlands, March 2024 |
| September 2023 | 5410.7 µg/m³ | 472ndof 2,176 | United Kingdom, Belgium and 2 more countries, September 2023 |
| May 2024 | 5410.7 µg/m³ | 642ndof 2,684 | – |
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.
Dartford's worst days
| Day | US AQI | Episode |
|---|---|---|
| 26 Jan 2026 | 11039.3 µg/m³ | Europe, January and February 2026 |
| 10 Sept 2023 | 11039.2 µg/m³ | United Kingdom, Belgium and 2 more countries, September 2023 |
| 11 Mar 2024 | 10838.4 µg/m³ | United Kingdom and The Netherlands, March 2024 |
| 7 Sept 2023 | 10838.3 µg/m³ | United Kingdom, Belgium and 2 more countries, September 2023 |
| 11 Jan 2025 | 10135.7 µg/m³ | Western Europe, January 2025 |
| 5 Nov 2024 | 9934.8 µg/m³ | Europe, November 2024 |
| 23 Mar 2026 | 9532.9 µg/m³ | Europe, 18 to 25 March 2026 |
| 9 Mar 2026 | 8728.3 µg/m³ | Europe, 1 to 12 March 2026 |
| 5 Nov 2025 | 8628.0 µg/m³ | – |
| 6 Nov 2024 | 8326.5 µg/m³ | Europe, November 2024 |
Daily means, the highest since 7 Sept 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, Dartford, United Kingdom, 7 Sep 2023 – 19 Aug 2026. Monitor data from London Air Quality Network via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/gb/dartford/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.
Dartford now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 04:07 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).