SmogRank / Canada / British Columbia / Courtenay

Courtenay, month by month

Courtenay has a measured daily mean on 585 days since 1 January 2023. Its worst month was January 2024, at 52 US AQI (9.7 µg/m³), 919th of 2,385 cities on that month's world ranking. Its cleanest was June 2024, at 14 US AQI (2.5 µg/m³). 2024 averaged 27 US AQI (4.8 µg/m³), against 34 US AQI (6.1 µg/m³) in 2023.

Every month since 2023

2026too few days for a mean (a year needs 199)0 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnone
2025too few days for a mean (a year needs 256)0 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
202427 for the year282 days measured1,970th of 2,097 in the world
Jan52#919Feb47#959Mar27#1,347Apr19#2,347May18#2,555Jun14#2,526Jul18#2,510Aug24#1,943Sep16#1,991Oct17 daysNovnoneDecnone
202334 for the year303 days measured1,167th of 1,355 in the world
Jan47#646Feb1 dayMar11 daysApr26#1,406May33#1,310Jun24#1,476Jul17#1,392Aug37#1,455Sep27#2,014Oct41#974Nov48#969Dec39#1,520
Each square is a month's mean PM2.5 in US AQI from Courtenay'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 Courtenay marked; each year, the year's.
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

27 months
MonthWhy
Oct 2026No day measured.
Sep 2026No day measured.
Aug 2026No day measured.
Jul 2026No day measured.
Jun 2026No day measured.
May 2026No day measured.
Apr 2026No day measured.
Mar 2026No day measured.
Feb 2026No day measured.
Jan 2026No day measured.
Dec 2025No day measured.
Nov 2025No day measured.
Oct 2025No day measured.
Sep 2025No day measured.
Aug 2025No day measured.
Jul 2025No day measured.
Jun 2025No day measured.
May 2025No day measured.
Apr 2025No day measured.
Mar 2025No day measured.
Feb 2025No day measured.
Jan 2025No day measured.
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.
Oct 202417 of 31 days measured; a month needs 22. The others: 14 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 20231 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 2 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.

Courtenay's worst months

MonthUS AQIDays measuredWorld rank
January 2024 529.7 µg/m³30 of 31919thof 2,385
November 2023 488.6 µg/m³30 of 30969thof 2,243
February 2024 478.5 µg/m³26 of 29959thof 2,486
January 2023 478.4 µg/m³24 of 31646thof 1,261
October 2023 417.4 µg/m³31 of 31974thof 2,012
December 2023 397.1 µg/m³31 of 311,520thof 2,247

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.

Courtenay's worst days

DayUS AQIEpisode
27 Aug 2023 9432.4 µg/m³North-western United States and Canada, August 2023
26 Aug 2023 9029.8 µg/m³North-western United States and Canada, August 2023
28 Aug 2023 7723.3 µg/m³North-western United States and Canada, August 2023
25 Aug 2023 7622.5 µg/m³North-western United States and Canada, August 2023
21 Jan 2024 7421.7 µg/m³–
20 Jan 2024 7421.4 µg/m³–
30 May 2023 7321.0 µg/m³–
31 Jan 2023 6918.8 µg/m³–
30 Jan 2023 6617.4 µg/m³–
1 Jan 2024 6516.5 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, Courtenay, Canada, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ca/courtenay/history (accessed 12 Oct 2026).

Download chart (PNG)

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.

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

Updated 2026-10-12 21:07 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).