SmogRank / Ireland / Connacht

Air quality in Roscommon

No new readings from Roscommon's monitors since 3 Oct. All 52 monitors run by EEA in Ireland have stopped reporting, not only Roscommon's. The figures below are from before then; they update when the data returns.

Connacht, Ireland.

Mean for 3 Oct30US AQI
Good

PM2.5 5.4 µg/m³, 0.4× the WHO 24-hour guideline. The most recent day with readings.

About its typical day over the past year (5.8 µg/m³).

Where Roscommon ranks

24 hours–not enough data
7 days#2,217of 2,676, at 27 US AQI (4.9 µg/m³), 6 days to 3 Oct
30 days–not enough data
This year–not enough data

Bad-air episodes that reached Roscommon

Times when Roscommon and many cities around it had PM2.5 at twice their usual or more on the same days. All episodes.

The last 12 months, day by day

1102031Nov 2025DecJan 2026FebMarAprMayJunJulAugSepOct2025-11-01: 5.4 µg/m³2025-11-02: 5.5 µg/m³2025-11-03: 2.9 µg/m³2025-11-04: 9.9 µg/m³2025-11-05: 8.2 µg/m³2025-11-06: no daily value, only 11 of the 18 hours a day needs2025-11-07: no daily value, only 17 of the 18 hours a day needs2025-11-08: 5.8 µg/m³2025-11-09: 14.7 µg/m³2025-11-10: 10.6 µg/m³2025-11-11: 4.9 µg/m³2025-11-12: 7.4 µg/m³2025-11-13: 6.1 µg/m³2025-11-14: no daily value, only 17 of the 18 hours a day needs2025-11-15: 3.2 µg/m³2025-11-16: 6.1 µg/m³2025-11-17: 9.8 µg/m³2025-11-18: 4.0 µg/m³2025-11-19: no daily value, only 17 of the 18 hours a day needs2025-11-20: 3.8 µg/m³2025-11-21: 11.2 µg/m³2025-11-22: 7.2 µg/m³2025-11-23: 3.5 µg/m³2025-11-24: 4.3 µg/m³2025-11-25: no daily value, only 17 of the 18 hours a day needs2025-11-26: no daily value, only 15 of the 18 hours a day needs2025-11-27: no daily value, only 17 of the 18 hours a day needs2025-11-28: no daily value, only 8 of the 18 hours a day needs2025-11-29: no daily value, only 2 of the 18 hours a day needs2025-11-30: no daily value, only 3 of the 18 hours a day needs2025-12-01: no daily value, only 9 of the 18 hours a day needs2025-12-02: 7.9 µg/m³2025-12-03: 5.7 µg/m³2025-12-04: 8.3 µg/m³2025-12-05: no daily value, only 12 of the 18 hours a day needs2025-12-06: no daily value, only 17 of the 18 hours a day needs2025-12-07: 7.6 µg/m³2025-12-08: 9.2 µg/m³2025-12-09: 5.2 µg/m³2025-12-10: no daily value, only 14 of the 18 hours a day needs2025-12-11: no daily value, only 7 of the 18 hours a day needs2025-12-12: no daily value, only 8 of the 18 hours a day needs2025-12-13: no daily value, only 16 of the 18 hours a day needs2025-12-14: no daily value, only 14 of the 18 hours a day needs2025-12-15: no daily value, only 6 of the 18 hours a day needs2025-12-16: 10.1 µg/m³2025-12-17: no daily value, only 13 of the 18 hours a day needs2025-12-18: 7.3 µg/m³2025-12-19: 8.5 µg/m³2025-12-20: 6.1 µg/m³2025-12-21: 8.3 µg/m³2025-12-22: 15.0 µg/m³2025-12-23: 23.9 µg/m³2025-12-24: 11.8 µg/m³2025-12-25: 7.2 µg/m³2025-12-26: 8.6 µg/m³2025-12-27: 7.7 µg/m³2025-12-28: 12.5 µg/m³2025-12-29: 12.7 µg/m³2025-12-30: 9.1 µg/m³2025-12-31: 13.4 µg/m³2026-01-01: 5.5 µg/m³2026-01-02: 4.7 µg/m³2026-01-03: 5.6 µg/m³2026-01-04: 4.6 µg/m³2026-01-05: 6.7 µg/m³2026-01-06: 6.3 µg/m³2026-01-07: no daily value, only 12 of the 18 hours a day needs2026-01-08: no daily value, only 11 of the 18 hours a day needs2026-01-09: no daily value, only 17 of the 18 hours a day needs2026-01-10: 9.9 µg/m³2026-01-11: no daily value, only 17 of the 18 hours a day needs2026-01-12: no daily value, only 17 of the 18 hours a day needs2026-01-13: 8.7 µg/m³2026-01-14: 7.3 µg/m³2026-01-15: 9.8 µg/m³2026-01-16: 9.3 µg/m³2026-01-17: no daily value, only 15 of the 18 hours a day needs2026-01-18: 10.6 µg/m³2026-01-19: no daily value, only 17 of the 18 hours a day needs2026-01-20: 7.4 µg/m³2026-01-21: 7.1 µg/m³2026-01-22: 13.3 µg/m³2026-01-23: 11.6 µg/m³2026-01-24: 8.8 µg/m³2026-01-25: 8.2 µg/m³2026-01-26: 11.8 µg/m³2026-01-27: 4.9 µg/m³2026-01-28: 7.2 µg/m³2026-01-29: 5.3 µg/m³2026-01-30: 8.5 µg/m³2026-01-31: 12.1 µg/m³2026-02-01: 14.4 µg/m³2026-02-02: 10.9 µg/m³2026-02-03: 13.9 µg/m³2026-02-04: 8.3 µg/m³2026-02-05: 9.8 µg/m³2026-02-06: 3.9 µg/m³2026-02-07: 12.9 µg/m³2026-02-08: 18.2 µg/m³2026-02-09: 9.9 µg/m³2026-02-10: 9.5 µg/m³2026-02-11: no daily value, only 15 of the 18 hours a day needs2026-02-12: 3.7 µg/m³2026-02-13: 3.9 µg/m³2026-02-14: 9.5 µg/m³2026-02-15: 6.5 µg/m³2026-02-16: 5.2 µg/m³2026-02-17: 10.2 µg/m³2026-02-18: 5.6 µg/m³2026-02-19: no daily value, only 17 of the 18 hours a day needs2026-02-20: no daily value, only 17 of the 18 hours a day needs2026-02-21: 6.5 µg/m³2026-02-22: 3.5 µg/m³2026-02-23: 3.5 µg/m³2026-02-24: 3.5 µg/m³2026-02-25: 3.5 µg/m³2026-02-26: 3.5 µg/m³2026-02-27: 3.5 µg/m³2026-02-28: 0.4 µg/m³2026-03-01: no daily value, only 5 of the 18 hours a day needs2026-03-02: no daily value, only 13 of the 18 hours a day needs2026-03-03: 16.9 µg/m³2026-03-04: 18.3 µg/m³2026-03-05: 5.2 µg/m³2026-03-06: 8.4 µg/m³2026-03-07: 4.8 µg/m³2026-03-08: no daily value, only 13 of the 18 hours a day needs2026-03-09: no daily value, only 16 of the 18 hours a day needs2026-03-10: 3.7 µg/m³2026-03-11: 8.0 µg/m³2026-03-12: 6.4 µg/m³2026-03-13: 4.1 µg/m³2026-03-14: 5.8 µg/m³2026-03-15: 6.1 µg/m³2026-03-16: 6.8 µg/m³2026-03-17: 2.8 µg/m³2026-03-18: 7.4 µg/m³2026-03-19: 9.2 µg/m³2026-03-20: 26.4 µg/m³2026-03-21: 26.5 µg/m³2026-03-22: 15.3 µg/m³2026-03-23: 8.3 µg/m³2026-03-24: 2.6 µg/m³2026-03-25: 5.5 µg/m³2026-03-26: 6.5 µg/m³2026-03-27: 8.2 µg/m³2026-03-28: 5.2 µg/m³2026-03-29: 7.5 µg/m³2026-03-30: 0.7 µg/m³2026-03-31: no daily value, only 5 of the 18 hours a day needs2026-04-01: no daily value, only 16 of the 18 hours a day needs2026-04-02: 4.9 µg/m³2026-04-03: 1.8 µg/m³2026-04-04: no daily value, only 10 of the 18 hours a day needs2026-04-05: no daily value, no readings from the monitor2026-04-06: no daily value, only 12 of the 18 hours a day needs2026-04-07: 0.3 µg/m³2026-04-08: no daily value, only 6 of the 18 hours a day needs2026-04-09: no daily value, only 10 of the 18 hours a day needs2026-04-10: no daily value, only 15 of the 18 hours a day needs2026-04-11: no daily value, only 10 of the 18 hours a day needs2026-04-12: no daily value, only 7 of the 18 hours a day needs2026-04-13: no daily value, only 8 of the 18 hours a day needs2026-04-14: no daily value, only 2 of the 18 hours a day needs2026-04-15: no daily value, only 11 of the 18 hours a day needs2026-04-16: 6.9 µg/m³2026-04-17: 4.8 µg/m³2026-04-18: 3.7 µg/m³2026-04-19: 5.9 µg/m³2026-04-20: 5.2 µg/m³2026-04-21: 6.6 µg/m³2026-04-22: 10.0 µg/m³2026-04-23: 10.7 µg/m³2026-04-24: 11.8 µg/m³2026-04-25: 8.6 µg/m³2026-04-26: 7.2 µg/m³2026-04-27: 3.5 µg/m³2026-04-28: 6.4 µg/m³2026-04-29: 8.8 µg/m³2026-04-30: 9.4 µg/m³2026-05-01: 10.5 µg/m³2026-05-02: 6.4 µg/m³2026-05-03: no daily value, only 13 of the 18 hours a day needs2026-05-04: 4.3 µg/m³2026-05-05: 2.6 µg/m³2026-05-06: 3.9 µg/m³2026-05-07: 3.4 µg/m³2026-05-08: 4.2 µg/m³2026-05-09: 3.3 µg/m³2026-05-10: 3.2 µg/m³2026-05-11: 2.3 µg/m³2026-05-12: 8.3 µg/m³2026-05-13: 6.5 µg/m³2026-05-14: 3.5 µg/m³2026-05-15: 2.9 µg/m³2026-05-16: 1.6 µg/m³2026-05-17: 3.4 µg/m³2026-05-18: 2.9 µg/m³2026-05-19: 3.3 µg/m³2026-05-20: 5.2 µg/m³2026-05-21: 3.8 µg/m³2026-05-22: 6.3 µg/m³2026-05-23: 5.5 µg/m³2026-05-24: 3.3 µg/m³2026-05-25: no daily value, only 11 of the 18 hours a day needs2026-05-26: 6.9 µg/m³2026-05-27: 7.3 µg/m³2026-05-28: 6.8 µg/m³2026-05-29: 5.6 µg/m³2026-05-30: 5.2 µg/m³2026-05-31: 5.7 µg/m³2026-06-01: 2.3 µg/m³2026-06-02: 2.9 µg/m³2026-06-03: 2.8 µg/m³2026-06-04: 3.2 µg/m³2026-06-05: 4.2 µg/m³2026-06-06: 2.5 µg/m³2026-06-07: 6.5 µg/m³2026-06-08: no daily value, only 17 of the 18 hours a day needs2026-06-09: no daily value, only 13 of the 18 hours a day needs2026-06-10: no daily value, only 12 of the 18 hours a day needs2026-06-11: 2.8 µg/m³2026-06-12: no daily value, only 17 of the 18 hours a day needs2026-06-13: no daily value, only 12 of the 18 hours a day needs2026-06-14: 4.1 µg/m³2026-06-15: 5.6 µg/m³2026-06-16: 3.1 µg/m³2026-06-17: 4.2 µg/m³2026-06-18: 3.0 µg/m³2026-06-19: 1.1 µg/m³2026-06-20: 2.9 µg/m³2026-06-21: no daily value, only 12 of the 18 hours a day needs2026-06-22: no daily value, only 9 of the 18 hours a day needs2026-06-23: no daily value, only 17 of the 18 hours a day needs2026-06-24: 12.3 µg/m³2026-06-25: 9.5 µg/m³2026-06-26: no daily value, only 11 of the 18 hours a day needs2026-06-27: no daily value, only 8 of the 18 hours a day needs2026-06-28: 4.7 µg/m³2026-06-29: 5.8 µg/m³2026-06-30: 2.2 µg/m³2026-07-01: 2.2 µg/m³2026-07-02: 4.2 µg/m³2026-07-03: 4.0 µg/m³2026-07-04: 2.3 µg/m³2026-07-05: 1.1 µg/m³2026-07-06: 2.6 µg/m³2026-07-07: 3.1 µg/m³2026-07-08: 2.7 µg/m³2026-07-09: 2.6 µg/m³2026-07-10: 5.0 µg/m³2026-07-11: 4.2 µg/m³2026-07-12: 8.2 µg/m³2026-07-13: 8.2 µg/m³2026-07-14: 6.8 µg/m³2026-07-15: no daily value, no readings from the monitor2026-07-16: no daily value, no readings from the monitor2026-07-17: no daily value, only 9 of the 18 hours a day needs2026-07-18: no daily value, only 16 of the 18 hours a day needs2026-07-19: no daily value, only 12 of the 18 hours a day needs2026-07-20: no daily value, only 13 of the 18 hours a day needs2026-07-21: 2.3 µg/m³2026-07-22: no daily value, only 17 of the 18 hours a day needs2026-07-23: no daily value, only 15 of the 18 hours a day needs2026-07-24: no daily value, only 15 of the 18 hours a day needs2026-07-25: no daily value, only 17 of the 18 hours a day needs2026-07-26: 1.6 µg/m³2026-07-27: no daily value, only 17 of the 18 hours a day needs2026-07-28: no daily value, only 13 of the 18 hours a day needs2026-07-29: no daily value, only 12 of the 18 hours a day needs2026-07-30: no daily value, only 14 of the 18 hours a day needs2026-07-31: no daily value, only 16 of the 18 hours a day needs2026-08-01: no daily value, only 14 of the 18 hours a day needs2026-08-02: no daily value, only 13 of the 18 hours a day needs2026-08-03: 5.7 µg/m³2026-08-04: no daily value, only 17 of the 18 hours a day needs2026-08-05: 2.9 µg/m³2026-08-06: no daily value, only 12 of the 18 hours a day needs2026-08-07: no daily value, only 12 of the 18 hours a day needs2026-08-08: no daily value, only 17 of the 18 hours a day needs2026-08-09: no daily value, only 17 of the 18 hours a day needs2026-08-10: no daily value, only 15 of the 18 hours a day needs2026-08-11: no daily value, only 17 of the 18 hours a day needs2026-08-12: no daily value, only 16 of the 18 hours a day needs2026-08-13: 3.6 µg/m³2026-08-14: 1.9 µg/m³2026-08-15: no daily value, only 16 of the 18 hours a day needs2026-08-16: no daily value, only 12 of the 18 hours a day needs2026-08-17: no daily value, only 16 of the 18 hours a day needs2026-08-18: 3.5 µg/m³2026-08-19: no daily value, only 14 of the 18 hours a day needs2026-08-20: 3.1 µg/m³2026-08-21: no daily value, only 17 of the 18 hours a day needs2026-08-22: 4.1 µg/m³2026-08-23: no daily value, only 12 of the 18 hours a day needs2026-08-24: 5.7 µg/m³2026-08-25: no daily value, only 16 of the 18 hours a day needs2026-08-26: no daily value, only 17 of the 18 hours a day needs2026-08-27: no daily value, only 16 of the 18 hours a day needs2026-08-28: 10.8 µg/m³2026-08-29: 6.0 µg/m³2026-08-30: no daily value, only 7 of the 18 hours a day needs2026-08-31: no daily value, only 16 of the 18 hours a day needs2026-09-01: no daily value, only 17 of the 18 hours a day needs2026-09-02: no daily value, only 14 of the 18 hours a day needs2026-09-03: no daily value, only 14 of the 18 hours a day needs2026-09-04: no daily value, only 17 of the 18 hours a day needs2026-09-05: no daily value, only 16 of the 18 hours a day needs2026-09-06: no daily value, only 6 of the 18 hours a day needs2026-09-07: 4.4 µg/m³2026-09-08: 3.6 µg/m³2026-09-09: no daily value, only 16 of the 18 hours a day needs2026-09-10: no daily value, only 10 of the 18 hours a day needs2026-09-11: 14.1 µg/m³2026-09-12: no daily value, only 16 of the 18 hours a day needs2026-09-13: no daily value, only 12 of the 18 hours a day needs2026-09-14: no daily value, only 15 of the 18 hours a day needs2026-09-15: no daily value, only 15 of the 18 hours a day needs2026-09-16: no daily value, only 17 of the 18 hours a day needs2026-09-17: 9.2 µg/m³2026-09-18: 5.8 µg/m³2026-09-19: no daily value, only 14 of the 18 hours a day needs2026-09-20: no daily value, only 15 of the 18 hours a day needs2026-09-21: no daily value, only 16 of the 18 hours a day needs2026-09-22: no daily value, only 16 of the 18 hours a day needs2026-09-23: 4.0 µg/m³2026-09-24: 3.6 µg/m³2026-09-25: 6.3 µg/m³2026-09-26: 4.6 µg/m³2026-09-27: 3.2 µg/m³2026-09-28: 3.9 µg/m³2026-09-29: 5.7 µg/m³2026-09-30: 4.8 µg/m³2026-10-01: 5.4 µg/m³2026-10-02: 4.3 µg/m³2026-10-03: 5.4 µg/m³2026-10-04: no daily value, no readings from the monitor
7 of 232 measured days were over the WHO 24-hour guideline (15 µg/m³). 133 days without a value: 10 with no readings from the monitor, 123 with readings for part of the day (a day needs 18 hours); point at a grey square for its reason (why days go blank). One row per month, one square per local day.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

Hour by hour

No hourly readings in the last few days. The chart returns when the monitors' data arrives.

Where it stood each day

Top 10Top 100#1#10#100#1,000#3,193NovDecJanFebMarAprMayJunJulAugSep#1,562
Its rank on each day's world board, #1 being the most polluted city that day. Higher is worse. Each gridline down is ten times the rank above it (#1, #10, #100, #1,000), so the top places get the most room. See it among every city.

2026 against 2025, month by month

15Jan 2025: 9.9 µg/m³Jan 2026: 8.1 µg/m³JanFeb 2025: 11.5 µg/m³Feb 2026: 7.4 µg/m³FebMar 2025: 11.7 µg/m³Mar 2026: 8.7 µg/m³MarApr 2025: 9.3 µg/m³Apr 2026: 6.5 µg/m³AprMay 2025: 7.6 µg/m³May 2026: 4.8 µg/m³MayJun 2026: 4.3 µg/m³JunJul 2025: 4.4 µg/m³Jul 2026: 3.8 µg/m³JulAug 2025: 6.8 µg/m³Aug 2026: 4.7 µg/m³AugSep 2026: 5.6 µg/m³SepOctNov 2025: 6.7 µg/m³NovDec 2025: 9.8 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

Monitors

PM2.5 from 1 reference monitor. None of them reported in the last 24 hours.

StationOperatorType
Roscommon Roscommon Town County Council OfficesODC-BYEEAReference

The city's value is the median of its reference monitors each hour, when at least a third of them report (three are always enough); low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Use this page

SmogRank, PM2.5 daily means, Roscommon, Ireland, 8 Oct 2025 – 3 Oct 2026, smogrank.com/ie/roscommon (accessed 5 Oct 2026).

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Other cities in Ireland

30-day averages, US AQI. All of Ireland.

Updated 2026-10-05 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.