SmogRank / Slovakia / Bratislava Region / Bratislava
Bratislava, month by month
Bratislava has a measured daily mean on 1,136 days since 1 January 2023. Its worst month was February 2025, at 79 US AQI (24.1 µg/m³), 305th of 2,633 cities on that month's world ranking. Its cleanest was September 2026, at 40 US AQI (7.2 µg/m³). 2025 averaged 56 US AQI (11.9 µg/m³), against 59 US AQI (13.3 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
9 months
| Month | Why |
|---|---|
| Mar 2026 | 19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 14 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | 15 of 31 days measured; a month needs 22. The others: 16 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. |
| Mar 2024 | 14 of 31 days measured; a month needs 22. The others: 17 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.
Bratislava's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 7924.1 µg/m³ | 305thof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| March 2025 | 6617.3 µg/m³ | 747thof 2,862 | Germany, Poland and 25 more countries, March 2025 Europe, 14 February to 1 March 2025 |
| November 2024 | 6616.9 µg/m³ | 336thof 2,624 | Europe, November 2024 Eastern Europe, October and November 2024 |
| December 2024 | 6416.1 µg/m³ | 414thof 2,616 | Europe, 24 December 2024 to 3 January 2025 Serbia, Slovenia and 10 more countries, December 2024 |
| January 2024 | 6315.7 µg/m³ | 423rdof 2,385 | Europe, 27 January to 2 February 2024 Europe, 8 to 27 January 2024and 1 more |
| January 2025 | 6315.5 µg/m³ | 462ndof 2,474 | Germany, France and 19 more countries, January 2025 Europe, 24 December 2024 to 3 January 2025 |
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.
Bratislava's worst days
| Day | US AQI | Episode |
|---|---|---|
| 29 Dec 2024 | 14854.6 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 30 Dec 2024 | 12746.1 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 24 Feb 2025 | 11842.6 µg/m³ | Europe, 14 February to 1 March 2025 |
| 7 Feb 2025 | 11842.5 µg/m³ | Europe, 1 to 14 February 2025 |
| 31 Jan 2024 | 10838.2 µg/m³ | Europe, 27 January to 2 February 2024 |
| 27 Dec 2024 | 10838.2 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 3 Mar 2023 | 10737.9 µg/m³ | Europe, 28 February to 4 March 2023 |
| 9 Mar 2025 | 10637.5 µg/m³ | Germany, Poland and 25 more countries, March 2025 |
| 5 Feb 2025 | 10336.3 µg/m³ | Europe, 1 to 14 February 2025 |
| 9 Jan 2024 | 10135.7 µg/m³ | Europe, 8 to 27 January 2024 |
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, Bratislava, Slovakia, 1 Jan 2023 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/sk/bratislava/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.
Bratislava now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 23:07 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).