SmogRank / Canada / Nova Scotia / Port Wallace

Port Wallace, month by month

Port Wallace has a measured daily mean on 1,120 days since 1 January 2023. Its worst month was July 2025, at 32 US AQI (5.7 µg/m³), 2,420th of 2,889 cities on that month's world ranking. Its cleanest was February 2026, at 11 US AQI (1.9 µg/m³). 2025 averaged 20 US AQI (3.6 µg/m³), against 19 US AQI (3.5 µg/m³) in 2024.

Every month since 2023

202619 so far280 days measured2,775th of 2,793 in the world

Jan19#2,554 Feb11#2,856 Mar16#2,930 Apr17#2,877 May18#2,778 Jun21#2,354 Jul28#2,581 Aug27#2,780 Sep16#2,926 Oct19#2,641

202520 for the year354 days measured2,660th of 2,681 in the world

Jan17#2,447 Feb17#2,607 Mar17#2,806 Apr16#2,922 May17#2,743 Jun29#2,276 Jul32#2,420 Aug27#2,732 Sep17#3,057 Oct18#2,541 Nov16#2,675 Dec17#2,944

202419 for the year302 days measured2,072nd of 2,097 in the world

Jan21#2,280Feb16 daysMar21 daysApr20#2,313 May15#2,616Jun17 daysJul26#2,346 Aug29#1,850 Sep21#1,953 Oct18#1,986 Nov13#2,600 Dec16#2,566

2023too few days for a mean (a year needs 256)184 days measured

Jan18#1,217Feb3 daysMar11 daysApr10 daysMaynoneJun18 daysJul12 daysAug16 daysSep19 daysOct21 daysNov23#2,103 Dec26#2,072

Each square is a month's mean PM2.5 in US AQI from Port Wallace'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 Port Wallace 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

12 months

Month	Why
Jun 2024	17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks.
Mar 2024	21 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 9 with under 18 hours of readings or readings that failed our checks.
Feb 2024	16 of 29 days measured; a month needs 21. The others: 1 missing from OpenAQ's archive, 12 with under 18 hours of readings or readings that failed our checks.
Oct 2023	21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Sep 2023	19 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
Aug 2023	16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Jul 2023	12 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 18 with under 18 hours of readings or readings that failed our checks.
Jun 2023	18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
May 2023	No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2023	10 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive, 17 with under 18 hours of readings or readings that failed our checks.
Mar 2023	11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive.
Feb 2023	3 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.

Port Wallace's worst months

Month	US AQI	Days measured	World rank
July 2025	325.7 µg/m³	31 of 31	2,420thof 2,889
August 2024	295.3 µg/m³	31 of 31	1,850thof 2,010
June 2025	295.2 µg/m³	30 of 30	2,276thof 2,508
July 2026	285.1 µg/m³	31 of 31	2,581stof 2,784
August 2025	274.8 µg/m³	31 of 31	2,732ndof 2,901
August 2026	274.8 µg/m³	30 of 31	2,780thof 2,896

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.

Port Wallace's worst days

Day	US AQI
5 Aug 2025	7119.8 µg/m³
18 Dec 2023	6717.7 µg/m³
13 Jun 2023	6617.4 µg/m³
12 Jun 2025	6114.4 µg/m³
31 Jul 2025	6014.1 µg/m³
16 Jul 2025	6013.9 µg/m³
21 Aug 2023	5813.1 µg/m³
29 Sept 2023	5812.8 µg/m³
21 Jul 2023	5812.7 µg/m³
15 Jul 2026	5611.7 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, Port Wallace, 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/port-wallace/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.

Port Wallace 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).