SmogRank / United Kingdom / England / Irlam

Irlam, month by month

Irlam has a measured daily mean on 790 days since 2 January 2023. Its worst month was April 2025, at 52 US AQI (9.9 µg/m³), 1,197th of 2,951 cities on that month's world ranking. Its cleanest was September 2025, at 23 US AQI (4.1 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)94 days measured
Jan41#1,712Feb32#2,465Mar48#1,950AprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOct18#2,672
2025too few days for a mean (a year needs 256)229 days measured
JannoneFebnoneMar2 daysApr52#1,197May37#1,706Jun31#2,233Jul31#2,486Aug38#2,249Sep23#2,920Oct42#1,028Nov12 daysDec32#2,530
2024too few days for a mean (a year needs 257)254 days measured
Jan36#1,704Feb33#1,839Mar20 daysApr18 daysMay48#1,094Jun31#2,153Jul23#2,429Aug34#1,708Sep43#934Oct32#1,592NovnoneDecnone
2023too few days for a mean (a year needs 256)213 days measured
Jan19 daysFeb2 daysMar8 daysApr46#752May18 daysJun17 daysJul19 daysAug19 daysSep43#1,233Oct15 daysNov40#1,380Dec33#1,822
Each square is a month's mean PM2.5 in US AQI from Irlam'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 Irlam 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

22 months
MonthWhy
Sep 2026No day measured. The others: 30 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 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Nov 202512 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks.
Mar 20252 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Feb 2025No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Apr 202418 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
Mar 202420 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Oct 202315 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Aug 202319 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Jul 202319 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 11 with under 18 hours of readings or readings that failed our checks.
Jun 202317 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks.
May 202318 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Mar 20238 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 3 with under 18 hours of readings or readings that failed our checks.
Feb 20232 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 1 with under 18 hours of readings or readings that failed our checks.
Jan 202319 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 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.

Irlam's worst months

MonthUS AQIDays measuredWorld rankEpisode
April 2025 529.9 µg/m³28 of 301,197thof 2,951–
March 2026 488.7 µg/m³26 of 311,950thof 2,971Europe, 18 to 25 March 2026
May 2024 488.6 µg/m³25 of 311,094thof 2,684–
April 2023 468.3 µg/m³21 of 30752ndof 1,622–
September 2023 437.7 µg/m³23 of 301,233rdof 2,176–
September 2024 437.7 µg/m³27 of 30934thof 2,010–

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.

Irlam's worst days

DayUS AQIEpisode
11 Apr 2025 9532.5 µg/m³–
21 Mar 2026 8426.6 µg/m³Europe, 18 to 25 March 2026
14 Feb 2023 8326.3 µg/m³Europe, 6 to 25 February 2023
15 Feb 2023 8226.0 µg/m³Europe, 6 to 25 February 2023
24 Jan 2023 8125.0 µg/m³France, The Netherlands and United Kingdom, January 2023
12 Apr 2025 7924.2 µg/m³–
9 Sept 2023 7622.7 µg/m³–
5 Mar 2026 7521.8 µg/m³–
2 Dec 2023 7320.7 µg/m³–
26 Nov 2023 7220.3 µg/m³–

Daily means, the highest since 2 Jan 2023; 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, Irlam, United Kingdom, 2 Jan 2023 – 12 Oct 2026. Monitor data from UK-AIR (Defra), read from the publisher; sources listed at smogrank.com/sources. smogrank.com/gb/irlam/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.

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

Updated 2026-10-12 23:07 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).