SmogRank / Ireland / Leinster / Tallaght

Tallaght, month by month

Tallaght has a measured daily mean on 121 days since 28 May 2025. Its worst month was April 2026, at 35 US AQI (6.3 µg/m³), 2,114th of 2,941 cities on that month's world ranking. Its cleanest was May 2026, at 27 US AQI (4.8 µg/m³).

Every month since 2025

2026too few days for a mean (a year needs 200)80 days measured
JannoneFebnoneMar3 daysApr35#2,114May27#2,415Jun5 daysJulnoneAugnoneSep9 daysOct22#2,385
2025too few days for a mean (a year needs 256)41 days measured
JanFebMarAprMay4 daysJun2 daysJul7 daysAug13 daysSep11 daysOct4 daysNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Tallaght's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Tallaght marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Unhealthy for 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

Months without a mean, and why

15 months
MonthWhy
Sep 20269 of 30 days measured; a month needs 21. The others: 1 with readings for part of the day (a day needs 18 hours), 20 with under 18 hours of readings or readings that failed our checks.
Aug 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 20265 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks.
Mar 20263 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Feb 2026No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 20254 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Sep 202511 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks.
Aug 202513 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Jul 20257 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks.
Jun 20252 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
May 20254 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.

Tallaght's worst months

MonthUS AQIDays measuredWorld rank
April 2026 356.3 µg/m³26 of 302,114thof 2,941
May 2026 274.8 µg/m³28 of 312,415thof 2,874

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.

Tallaght's worst days

DayUS AQI
28 May 2026 6315.5 µg/m³
30 Mar 2026 6114.3 µg/m³
18 Aug 2025 5913.3 µg/m³
17 Aug 2025 5813.1 µg/m³
21 Jun 2025 5812.9 µg/m³
23 Apr 2026 5712.5 µg/m³
16 Aug 2025 5611.9 µg/m³
22 Apr 2026 5410.5 µg/m³
30 Apr 2026 529.8 µg/m³
8 Apr 2026 529.6 µg/m³

Daily means, the highest since 28 May 2025; 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, Tallaght, Ireland, 28 May 2025 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ie/tallaght/history (accessed 13 Oct 2026).

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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.

Tallaght now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-13 03:07 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).