SmogRank / Slovakia / Žilina Region / Ružomberok
Ružomberok, month by month
Ružomberok has a measured daily mean on 1,068 days since 1 January 2023. Its worst month was February 2023, at 97 US AQI (33.9 µg/m³), 16th of 1,129 cities on that month's world ranking. Its cleanest was May 2025, at 38 US AQI (6.8 µg/m³). 2025 averaged 62 US AQI (14.8 µg/m³), against 62 US AQI (14.9 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
12 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. |
| Dec 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Nov 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 2025 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Nov 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 2024 | 12 of 31 days measured; a month needs 22. The others: 19 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 | 16 of 30 days measured; a month needs 21. The others: 14 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.
Ružomberok's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2023 | 9733.9 µg/m³ | 16thof 1,129 | Europe, 6 to 25 February 2023 |
| February 2025 | 9030.1 µg/m³ | 213thof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| January 2025 | 8829.0 µg/m³ | 103rdof 2,474 | Germany, France and 19 more countries, January 2025 Europe, 24 December 2024 to 3 January 2025 |
| December 2023 | 7924.3 µg/m³ | 103rdof 2,247 | South-eastern Europe, 28 December 2023 to 1 January 2024 Eastern Europe, December 2023and 2 more |
| December 2024 | 7924.2 µg/m³ | 148thof 2,616 | Europe, 24 December 2024 to 3 January 2025 |
| January 2023 | 7622.4 µg/m³ | 117thof 1,261 | Eastern Europe, January 2023 Czechia, Slovakia and Poland, January 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.
Ružomberok's worst days
| Day | US AQI | Episode |
|---|---|---|
| 10 Feb 2023 | 194117.3 µg/m³ | Europe, 6 to 25 February 2023 |
| 8 Feb 2023 | 17792.9 µg/m³ | Europe, 6 to 25 February 2023 |
| 1 Jan 2025 | 17589.3 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 9 Feb 2023 | 16879.8 µg/m³ | Europe, 6 to 25 February 2023 |
| 17 Feb 2023 | 16677.6 µg/m³ | Europe, 6 to 25 February 2023 |
| 31 Dec 2024 | 16574.8 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 1 Jan 2023 | 16474.1 µg/m³ | Eastern Europe, January 2023 |
| 16 Feb 2023 | 16170.3 µg/m³ | Europe, 6 to 25 February 2023 |
| 30 Dec 2024 | 16169.1 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 21 Jan 2025 | 15966.5 µg/m³ | Germany, France and 19 more countries, January 2025 |
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, Ružomberok, 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/ruzomberok/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.
Ružomberok 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).