SmogRank / Ireland / Leinster / Leixlip

Leixlip, month by month

Leixlip has a measured daily mean on 401 days since 21 May 2025. Its worst month was March 2026, at 50 US AQI (9.0 µg/m³), 1,881st of 2,971 cities on that month's world ranking. Its cleanest was September 2025, at 21 US AQI (3.7 µg/m³).

Every month since 2025

202635 so far250 days measured2,422nd of 2,791 in the world

Jan40#1,749 Feb43#2,049 Mar50#1,881 Apr38#1,950 May28#2,304Jun20 daysJul36#2,293 Aug31#2,606 Sep26#2,521 Oct25#2,322

2025too few days for a mean (a year needs 256)151 days measured

JanFebMarAprMay10 daysJun12 daysJul19 daysAug36#2,395 Sep21#2,993Oct13 daysNov29#2,377 Dec41#2,030

Each square is a month's mean PM2.5 in US AQI from Leixlip'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 Leixlip marked; each year, the year's. A dashed square is the running month, so far.

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

Months without a mean, and why

5 months

Month	Why
Jun 2026	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	13 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Jul 2025	19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Jun 2025	12 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks.
May 2025	10 of 31 days measured; a month needs 22. The others: 1 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.

Leixlip's worst months

Month	US AQI	Days measured	World rank	Episode
March 2026	509.0 µg/m³	29 of 31	1,881stof 2,971	Europe, 18 to 25 March 2026
February 2026	437.7 µg/m³	25 of 28	2,049thof 2,866	–
December 2025	417.4 µg/m³	23 of 31	2,030thof 3,006	–
January 2026	407.2 µg/m³	27 of 31	1,749thof 2,617	–
April 2026	386.8 µg/m³	29 of 30	1,950thof 2,941	–
July 2026	366.5 µg/m³	30 of 31	2,293rdof 2,784	–

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.

Leixlip's worst days

Day	US AQI	Episode
21 Mar 2026	9029.9 µg/m³	Europe, 18 to 25 March 2026
20 Mar 2026	8024.5 µg/m³	Europe, 18 to 25 March 2026
15 Jul 2026	7019.5 µg/m³	–
27 Aug 2026	6919.0 µg/m³	–
22 Mar 2026	6918.9 µg/m³	Europe, 18 to 25 March 2026
24 Jul 2025	6918.8 µg/m³	–
17 Jul 2026	6818.4 µg/m³	–
13 Aug 2025	6818.2 µg/m³	–
23 Dec 2025	6717.9 µg/m³	–
16 Jul 2026	6617.4 µg/m³	–

Daily means, the highest since 21 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, Leixlip, Ireland, 21 May 2025 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ie/leixlip/history (accessed 12 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.

Leixlip 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).