SmogRank / United Kingdom / Scotland / Penicuik

Penicuik, month by month

Penicuik has a measured daily mean on 729 days since 1 January 2023. Its worst month was May 2024, at 38 US AQI (6.9 µg/m³), 1,737th of 2,684 cities on that month's world ranking. Its cleanest was November 2023, at 12 US AQI (2.1 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)82 days measured
Jan25#2,420Feb23#2,700Mar27#2,708AprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOct13#2,745
2025too few days for a mean (a year needs 256)207 days measured
JannoneFebnoneMar2 daysApr33#2,309May28#2,302Jun27#2,306Jul22#2,763Aug26#2,747Sep13#3,088Oct18 daysNov5 daysDec18#2,938
2024too few days for a mean (a year needs 257)245 days measured
Jan22#2,250Feb17#2,430Mar21 daysApr13 daysMay38#1,737Jun19#2,442Jul15#2,546Aug22#1,970Sep27#1,814Oct22#1,934NovnoneDecnone
2023too few days for a mean (a year needs 256)195 days measured
Jan21 daysFeb3 daysMar11 daysApr32#1,241May15 daysJun14 daysJul15 daysAug18 daysSep17 daysOct14 daysNov12#2,230Dec20 days
Each square is a month's mean PM2.5 in US AQI from Penicuik'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 Penicuik 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

25 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 20255 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks.
Oct 202518 of 31 days measured; a month needs 22. The others: 13 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 202413 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks.
Mar 202421 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Dec 202320 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Oct 202314 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Sep 202317 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks.
Aug 202318 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Jul 202315 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 15 with under 18 hours of readings or readings that failed our checks.
Jun 202314 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks.
May 202315 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Mar 202311 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive.
Feb 20233 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive.
Jan 202321 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 4 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.

Penicuik's worst months

MonthUS AQIDays measuredWorld rank
May 2024 386.9 µg/m³31 of 311,737thof 2,684
April 2025 335.9 µg/m³27 of 302,309thof 2,951
April 2023 325.8 µg/m³21 of 301,241stof 1,622
May 2025 285.0 µg/m³26 of 312,302ndof 2,826
June 2025 274.9 µg/m³24 of 302,306thof 2,508
September 2024 274.8 µg/m³23 of 301,814thof 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.

Penicuik's worst days

DayUS AQI
21 Mar 2026 6818.4 µg/m³
14 Feb 2023 6617.2 µg/m³
15 May 2024 6516.7 µg/m³
2 Jan 2024 6416.3 µg/m³
25 Jan 2026 6416.3 µg/m³
24 Jul 2025 6215.1 µg/m³
23 Sept 2024 6214.8 µg/m³
14 Aug 2025 6214.8 µg/m³
17 May 2024 6114.6 µg/m³
18 May 2024 6114.5 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, Penicuik, 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/penicuik/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.

Penicuik 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).