SmogRank / Ireland / Leinster / Bray

Bray, month by month

Bray has a measured daily mean on 232 days since 23 May 2025. Its worst month was July 2026, at 37 US AQI (6.6 µg/m³), 2,269th of 2,784 cities on that month's world ranking. Its cleanest was September 2026, at 23 US AQI (4.1 µg/m³).

Every month since 2025

2026too few days for a mean (a year needs 199)167 days measured
Jan2 daysFeb1 dayMar4 daysApr33#2,241May24#2,572Jun20 daysJul37#2,269Aug25#2,807Sep23#2,711Oct20#2,576
2025too few days for a mean (a year needs 256)65 days measured
JanFebMarAprMay4 daysJun12 daysJul12 daysAug18 daysSep13 daysOct6 daysNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Bray'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 Bray 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

12 months
MonthWhy
Jun 202620 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Mar 20264 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Feb 20261 of 28 days measured; a month needs 20. The others: 27 with under 18 hours of readings or readings that failed our checks.
Jan 20262 of 31 days measured; a month needs 22. The others: 29 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 20256 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Sep 202513 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks.
Aug 202518 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Jul 202512 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks.
Jun 202512 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks.
May 20254 of 31 days measured; a month needs 22. The others: 5 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.

Bray's worst months

MonthUS AQIDays measuredWorld rank
July 2026 376.6 µg/m³29 of 312,269thof 2,784
April 2026 335.9 µg/m³28 of 302,241stof 2,941
August 2026 254.5 µg/m³24 of 312,807thof 2,896
May 2026 244.3 µg/m³29 of 312,572ndof 2,874
September 2026 234.1 µg/m³22 of 302,711thof 2,981

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.

Bray's worst days

DayUS AQI
24 Jul 2026 8929.3 µg/m³
24 Jul 2025 6918.6 µg/m³
15 Jul 2026 6818.3 µg/m³
27 Aug 2026 6717.8 µg/m³
8 Apr 2026 6215.0 µg/m³
16 Jul 2026 6214.9 µg/m³
17 Jul 2026 6114.3 µg/m³
30 Mar 2026 5812.6 µg/m³
12 Aug 2025 5611.7 µg/m³
21 Jun 2025 5511.4 µg/m³

Daily means, the highest since 23 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, Bray, Ireland, 23 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/bray/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.

Bray 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).