SmogRank / Canada / New Brunswick / Saint John East

Saint John East, month by month

Saint John East has a measured daily mean on 1,168 days since 7 May 2023. Its worst month was September 2023, at 39 US AQI (7.0 µg/m³), 1,504th of 2,176 cities on that month's world ranking. Its cleanest was November 2024, at 16 US AQI (2.8 µg/m³). 2025 averaged 26 US AQI (4.7 µg/m³), against 24 US AQI (4.3 µg/m³) in 2024.

Every month since 2023

202627 so far284 days measured2,670th of 2,798 in the world

Jan26#2,399 Feb23#2,700 Mar26#2,733 Apr20#2,795 May26#2,446 Jun29#2,093 Jul38#2,210 Aug31#2,606 Sep20#2,849 Oct21#2,539

202526 for the year290 days measured2,574th of 2,681 in the world

Jan24#2,323 Feb26#2,429 Mar23#2,623Apr6 daysMaynoneJun20 daysJul38#2,023 Aug32#2,574 Sep23#2,893 Oct23#2,346 Nov18#2,638 Dec21#2,880

202424 for the year356 days measured2,023rd of 2,097 in the world

Jan21#2,280 Feb19#2,378 Mar17#1,627 Apr21#2,292 May21#2,478 Jun31#2,133 Jul35#1,899 Aug37#1,634 Sep24#1,876 Oct22#1,934 Nov16#2,585 Dec21#2,480

2023too few days for a mean (a year needs 256)238 days measured

JanFebMarAprMay32#1,323 Jun36#1,279 Jul34#1,065 Aug32#1,683 Sep39#1,504 Oct33#1,492 Nov27#1,997 Dec28#2,019

Each square is a month's mean PM2.5 in US AQI from Saint John East'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 Saint John East 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

3 months

Month	Why
Jun 2025	20 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
May 2025	No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2025	6 of 30 days measured; a month needs 21. The others: 24 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.

Saint John East's worst months

Month	US AQI	Days measured	World rank
September 2023	397.0 µg/m³	30 of 30	1,504thof 2,176
July 2025	386.9 µg/m³	31 of 31	2,023rdof 2,889
July 2026	386.8 µg/m³	31 of 31	2,210thof 2,784
August 2024	376.6 µg/m³	31 of 31	1,634thof 2,010
June 2023	366.4 µg/m³	30 of 30	1,279thof 1,603
July 2024	356.3 µg/m³	31 of 31	1,899thof 2,566

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.

Saint John East's worst days

Day	US AQI
13 Jun 2023	7722.8 µg/m³
1 Oct 2023	7220.6 µg/m³
30 Sept 2023	7220.2 µg/m³
16 Aug 2026	7019.5 µg/m³
12 Jun 2023	6918.6 µg/m³
12 Jun 2025	6918.6 µg/m³
29 Sept 2023	6818.3 µg/m³
21 Aug 2023	6717.7 µg/m³
20 May 2026	6617.3 µg/m³
6 Jan 2026	6416.0 µg/m³

Daily means, the highest since 7 May 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, Saint John East, Canada, 7 May 2023 – 12 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ca/saint-john-east/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.

Saint John East 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).