SmogRank / Ireland / Leinster / Carlow
Carlow, month by month
Carlow has a measured daily mean on 569 days since 29 January 2024. Its worst month was January 2025, at 56 US AQI (11.7 µg/m³), 753rd of 2,474 cities on that month's world ranking. Its cleanest was July 2024, at 21 US AQI (3.7 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
20 months
| Month | Why |
|---|---|
| Oct 2026 | 7 of 11 days measured; a month needs 8. The others: 4 with readings for part of the day (a day needs 18 hours). |
| Jun 2026 | 18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 14 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Dec 2025 | 14 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | 15 of 30 days measured; a month needs 21. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 5 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks. |
| Sep 2025 | 9 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Aug 2025 | 11 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Jul 2025 | 4 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 8 of 30 days measured; a month needs 21. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| May 2025 | 7 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| Apr 2025 | 9 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Mar 2025 | 12 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | 19 of 28 days measured; a month needs 20. The others: 9 with under 18 hours of readings or readings that failed our checks. |
| Oct 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. |
| Sep 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | 11 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Apr 2024 | 3 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 10 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Jan 2024 | 3 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Carlow's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2025 | 5611.7 µg/m³ | 753rdof 2,474 | Western Europe, January 2025 |
| March 2026 | 529.7 µg/m³ | 1,734thof 2,971 | Europe, 18 to 25 March 2026 |
| November 2024 | 498.9 µg/m³ | 1,105thof 2,624 | – |
| May 2024 | 417.3 µg/m³ | 1,578thof 2,684 | – |
| February 2026 | 386.9 µg/m³ | 2,253rdof 2,866 | – |
| December 2024 | 376.6 µg/m³ | 1,845thof 2,616 | – |
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.
Carlow's worst days
| Day | US AQI | Episode |
|---|---|---|
| 9 Jan 2025 | 10135.6 µg/m³ | Western Europe, January 2025 |
| 21 Mar 2026 | 9532.5 µg/m³ | Europe, 18 to 25 March 2026 |
| 10 Mar 2025 | 9231.3 µg/m³ | Germany, Poland and 25 more countries, March 2025 |
| 9 Mar 2024 | 8728.2 µg/m³ | – |
| 9 Mar 2025 | 8426.7 µg/m³ | Germany, Poland and 25 more countries, March 2025 |
| 18 Feb 2025 | 8226.0 µg/m³ | Europe, 14 February to 1 March 2025 |
| 10 Jan 2025 | 8225.5 µg/m³ | Western Europe, January 2025 |
| 20 Mar 2026 | 8024.8 µg/m³ | Europe, 18 to 25 March 2026 |
| 12 May 2024 | 8024.5 µg/m³ | – |
| 8 Mar 2024 | 7924.3 µg/m³ | – |
Daily means, the highest since 29 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, Carlow, Ireland, 29 Jan 2024 – 9 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ie/carlow/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.
Carlow now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).