SmogRank / United Kingdom / Scotland / Glasgow

Glasgow, month by month

Glasgow has a measured daily mean on 826 days since 1 January 2023. Its worst month was May 2024, at 51 US AQI (9.2 µg/m³), 935th of 2,684 cities on that month's world ranking. Its cleanest was July 2024, at 19 US AQI (3.4 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)95 days measured
Jan36#1,956Feb32#2,465Mar41#2,272AprnoneMaynoneJunnoneJulnoneAugnoneSep1 dayOct26#2,247
2025too few days for a mean (a year needs 256)236 days measured
JannoneFebnoneMar2 daysApr39#2,002May36#1,795Jun33#2,174Jul28#2,595Aug32#2,574Sep20#3,000Oct30#1,866Nov11 daysDec32#2,530
202431 for the year275 days measured1,883rd of 2,097 in the world
Jan30#1,984Feb29#2,055Mar29#1,296Apr20 daysMay51#935Jun24#2,326Jul19#2,501Aug30#1,836Sep38#1,193Oct31#1,647NovnoneDecnone
2023too few days for a mean (a year needs 256)220 days measured
Jan25#1,131Feb3 daysMar8 daysApr20 daysMay18 daysJun18 daysJul17 daysAug21 daysSep32#1,864Oct16 daysNov26#2,030Dec24#2,108
Each square is a month's mean PM2.5 in US AQI from Glasgow'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 Glasgow 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

21 months
MonthWhy
Sep 20261 of 30 days measured; a month needs 21. The others: 29 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 202511 of 30 days measured; a month needs 21. The others: 19 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 202420 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Oct 202316 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Aug 202321 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jul 202317 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 13 with under 18 hours of readings or readings that failed our checks.
Jun 202318 of 30 days measured; a month needs 21. The others: 12 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.
Apr 202320 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive, 7 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 20233 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Glasgow's worst months

MonthUS AQIDays measuredWorld rank
May 2024 519.2 µg/m³31 of 31935thof 2,684
March 2026 417.4 µg/m³25 of 312,272ndof 2,971
April 2025 397.1 µg/m³28 of 302,002ndof 2,951
September 2024 386.9 µg/m³29 of 301,193rdof 2,010
January 2026 366.5 µg/m³29 of 311,956thof 2,617
May 2025 366.4 µg/m³28 of 311,795thof 2,826

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.

Glasgow's worst days

DayUS AQI
15 May 2024 7823.8 µg/m³
21 Mar 2026 7622.7 µg/m³
14 Feb 2023 7220.3 µg/m³
18 May 2024 7019.1 µg/m³
2 May 2024 6919.0 µg/m³
9 Sept 2023 6818.3 µg/m³
24 Sept 2024 6818.0 µg/m³
24 Jul 2025 6818.0 µg/m³
8 Sept 2024 6717.9 µg/m³
25 Jan 2026 6717.5 µg/m³

Daily means, the highest since 1 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, Glasgow, United Kingdom, 1 Jan 2023 – 12 Oct 2026. Monitor data from UK-AIR (Defra), read from the publisher; sources listed at smogrank.com/sources. smogrank.com/gb/glasgow/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.

Glasgow 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).