SmogRank / Slovakia / Nitra Region / Kolárovo
Kolárovo, month by month
Kolárovo has a measured daily mean on 951 days since 1 January 2023. Its worst month was February 2025, at 77 US AQI (23.2 µg/m³), 347th of 2,633 cities on that month's world ranking. Its cleanest was September 2026, at 32 US AQI (5.8 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
16 months
| Month | Why |
|---|---|
| Mar 2026 | 18 of 31 days measured; a month needs 22. The others: 10 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Feb 2026 | No day measured. The others: 28 with no readings from the monitor. |
| Jan 2026 | No day measured. The others: 31 with no readings from the monitor. |
| Dec 2025 | 2 of 31 days measured; a month needs 22. The others: 29 with readings for part of the day (a day needs 18 hours). |
| Oct 2025 | 14 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 16 with readings for part of the day (a day needs 18 hours). |
| Sep 2025 | 20 of 30 days measured; a month needs 21. The others: 10 with readings for part of the day (a day needs 18 hours). |
| Jul 2025 | 7 of 31 days measured; a month needs 22. The others: 24 with readings for part of the day (a day needs 18 hours). |
| Jun 2025 | 15 of 30 days measured; a month needs 21. The others: 15 with readings for part of the day (a day needs 18 hours). |
| Oct 2024 | 13 of 31 days measured; a month needs 22. The others: 18 with readings for part of the day (a day needs 18 hours). |
| Sep 2024 | No day measured. The others: 2 with no readings from the monitor, 28 with readings for part of the day (a day needs 18 hours). |
| Aug 2024 | 15 of 31 days measured; a month needs 22. The others: 4 with no readings from the monitor, 12 with readings for part of the day (a day needs 18 hours). |
| Apr 2024 | 17 of 30 days measured; a month needs 21. The others: 13 with readings for part of the day (a day needs 18 hours). |
| Mar 2024 | 14 of 31 days measured; a month needs 22. The others: 11 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours). |
| Apr 2023 | 20 of 30 days measured; a month needs 21. The others: 5 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours), 3 missing from OpenAQ's archive. |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Kolárovo's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 7723.2 µg/m³ | 347thof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| December 2024 | 7019.1 µg/m³ | 291stof 2,616 | Europe, 24 December 2024 to 3 January 2025 |
| November 2024 | 6919.0 µg/m³ | 251stof 2,624 | Eastern Europe, 25 to 29 November 2024 Southern Europe, November 2024and 2 more |
| December 2023 | 6717.5 µg/m³ | 212thof 2,247 | Eastern Europe, December 2023 Europe, December 2023 |
| January 2024 | 6617.0 µg/m³ | 364thof 2,385 | Europe, 8 to 27 January 2024 |
| January 2025 | 6114.3 µg/m³ | 528thof 2,474 | 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.
Kolárovo's worst days
| Day | US AQI | Episode |
|---|---|---|
| 29 Dec 2024 | 15662.0 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 28 Dec 2024 | 14854.4 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 24 Feb 2025 | 12545.4 µg/m³ | Europe, 14 February to 1 March 2025 |
| 27 Dec 2024 | 12545.2 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 5 Feb 2025 | 11742.0 µg/m³ | Europe, 1 to 14 February 2025 |
| 7 Feb 2025 | 11440.8 µg/m³ | Europe, 1 to 14 February 2025 |
| 11 Jan 2024 | 10637.7 µg/m³ | Europe, 8 to 27 January 2024 |
| 30 Dec 2024 | 10035.2 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 7 Nov 2024 | 9934.8 µg/m³ | Europe, November 2024 |
| 23 Jan 2024 | 9734.0 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, Kolárovo, 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/kolarovo/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.
Kolárovo now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 02:07 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).