SmogRank / Hungary / Hajdú-Bihar / Debrecen
Debrecen, month by month
Debrecen has a measured daily mean on 839 days since 24 January 2024. Its worst month was January 2026, at 143 US AQI (52.7 µg/m³), 34th of 2,617 cities on that month's world ranking. Its cleanest was July 2026, at 42 US AQI (7.6 µg/m³).
Every month since 2024
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
7 months
| Month | Why |
|---|---|
| Feb 2025 | 17 of 28 days measured; a month needs 20. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | 9 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| May 2024 | 13 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Apr 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Feb 2024 | No day measured. The others: 1 missing from OpenAQ's archive, 28 with under 18 hours of readings or readings that failed our checks. |
| Jan 2024 | 5 of 31 days measured; a month needs 22. The others: 3 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.
Debrecen's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2026 | 14352.7 µg/m³ | 34thof 2,617 | Europe, January and February 2026 |
| November 2024 | 13047.3 µg/m³ | 33rdof 2,624 | Eastern Europe, 30 November to 8 December 2024 Eastern Europe, 25 to 29 November 2024and 2 more |
| December 2024 | 11942.7 µg/m³ | 34thof 2,616 | Eastern Europe, 30 November to 8 December 2024 |
| December 2025 | 11139.4 µg/m³ | 255thof 3,006 | Eastern Europe, 16 to 21 December 2025 |
| March 2025 | 10436.6 µg/m³ | 202ndof 2,862 | Germany, Poland and 25 more countries, March 2025 Europe, 14 February to 1 March 2025 |
| February 2026 | 9834.2 µg/m³ | 206thof 2,866 | Europe, January and February 2026 |
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.
Debrecen's worst days
| Day | US AQI | Episode |
|---|---|---|
| 21 Jan 2026 | 200125.0 µg/m³ | Europe, January and February 2026 |
| 17 Dec 2025 | 18096.7 µg/m³ | Eastern Europe, 16 to 21 December 2025 |
| 22 Jan 2026 | 18096.6 µg/m³ | Europe, January and February 2026 |
| 18 Dec 2025 | 17184.7 µg/m³ | Eastern Europe, 16 to 21 December 2025 |
| 7 Nov 2024 | 17184.5 µg/m³ | Europe, November 2024 |
| 27 Nov 2024 | 17083.3 µg/m³ | Eastern Europe, 25 to 29 November 2024 |
| 24 Jan 2026 | 16778.7 µg/m³ | Europe, January and February 2026 |
| 4 Dec 2024 | 16778.5 µg/m³ | Eastern Europe, 30 November to 8 December 2024 |
| 23 Jan 2026 | 16777.9 µg/m³ | Europe, January and February 2026 |
| 28 Nov 2024 | 16677.0 µg/m³ | Eastern Europe, 25 to 29 November 2024 |
Daily means, the highest since 24 Jan 2024; 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, Debrecen, Hungary, 24 Jan 2024 – 11 Oct 2026. Monitor data from AirGradient via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/hu/debrecen/history (accessed 12 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.
Debrecen now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 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).