SmogRank / Slovakia / Banská Bystrica Region / Zvolen
Zvolen, month by month
Zvolen has a measured daily mean on 1,093 days since 1 January 2023. Its worst month was February 2025, at 83 US AQI (26.3 µg/m³), 262nd of 2,633 cities on that month's world ranking. Its cleanest was September 2026, at 38 US AQI (6.9 µg/m³). 2025 averaged 59 US AQI (13.2 µg/m³), against 58 US AQI (12.8 µg/m³) in 2023.
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 |
|---|---|
| Mar 2026 | 18 of 31 days measured; a month needs 22. The others: 13 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. |
| Nov 2025 | 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 2025 | 17 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 20 of 30 days measured; a month needs 21. 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 | 14 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Apr 2024 | 20 of 30 days measured; a month needs 21. The others: 10 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.
Zvolen's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 8326.3 µg/m³ | 262ndof 2,633 | Europe, 14 February to 1 March 2025 |
| December 2024 | 7521.9 µg/m³ | 198thof 2,616 | Europe, 24 December 2024 to 3 January 2025 |
| November 2024 | 7421.7 µg/m³ | 173rdof 2,624 | Southern Europe, November 2024 Europe, November 2024and 1 more |
| December 2023 | 7320.9 µg/m³ | 148thof 2,247 | South-eastern Europe, 28 December 2023 to 1 January 2024 Europe, December 2023and 1 more |
| January 2025 | 7320.7 µg/m³ | 277thof 2,474 | Germany, France and 19 more countries, January 2025 Eastern Europe, January 2025and 1 more |
| February 2023 | 7120.1 µg/m³ | 132ndof 1,129 | Europe, 6 to 25 February 2023 |
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.
Zvolen's worst days
| Day | US AQI | Episode |
|---|---|---|
| 10 Feb 2023 | 12645.6 µg/m³ | Europe, 6 to 25 February 2023 |
| 29 Dec 2024 | 12645.6 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 11 Feb 2023 | 12444.7 µg/m³ | Europe, 6 to 25 February 2023 |
| 16 Feb 2023 | 11842.3 µg/m³ | Europe, 6 to 25 February 2023 |
| 8 Feb 2023 | 11742.0 µg/m³ | Europe, 6 to 25 February 2023 |
| 7 Feb 2023 | 11641.5 µg/m³ | Europe, 6 to 25 February 2023 |
| 17 Feb 2023 | 11641.5 µg/m³ | Europe, 6 to 25 February 2023 |
| 30 Dec 2024 | 11440.6 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 31 Jan 2024 | 10938.8 µg/m³ | – |
| 29 Dec 2023 | 10938.7 µg/m³ | South-eastern Europe, 28 December 2023 to 1 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, Zvolen, Slovakia, 1 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/sk/zvolen/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.
Zvolen now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 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).