SmogRank / Canada / Quebec / Sept-Îles

Sept-Îles, month by month

Sept-Îles has a measured daily mean on 515 days since 30 April 2025. Its worst month was July 2025, at 53 US AQI (10.2 µg/m³), 1,223rd of 2,889 cities on that month's world ranking. Its cleanest was November 2025, at 13 US AQI (2.3 µg/m³).

Every month since 2025

202628 so far278 days measured2,624th of 2,791 in the world

Jan26#2,382 Feb20#2,774 Mar21#2,834 Apr24#2,656 May18#2,778 Jun35#1,780 Jul52#1,517 Aug39#2,047 Sep21#2,791 Oct18#2,632

2025too few days for a mean (a year needs 256)237 days measured

JanFebMarApr1 dayMay22#2,600 Jun52#1,419 Jul53#1,223 Aug43#1,882 Sep23#2,920 Oct19#2,525 Nov13#2,698 Dec17#2,954

Each square is a month's mean PM2.5 in US AQI from Sept-Îles'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 Sept-Îles 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

1 month

Month	Why
Apr 2025	1 of 30 days measured; a month needs 21.

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

Sept-Îles's worst months

Month	US AQI	Days measured	World rank	Episode
July 2025	5310.2 µg/m³	31 of 31	1,223rdof 2,889	–
June 2025	529.6 µg/m³	30 of 30	1,419thof 2,508	Northern United States and Canada, May and June 2025
July 2026	529.4 µg/m³	31 of 31	1,517thof 2,784	–
August 2025	437.8 µg/m³	31 of 31	1,882ndof 2,901	–
August 2026	397.1 µg/m³	31 of 31	2,047thof 2,896	–
June 2026	356.3 µg/m³	30 of 30	1,780thof 2,497	–

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.

Sept-Îles's worst days

Day	US AQI	Episode
6 Jun 2025	16778.0 µg/m³	Northern United States and Canada, May and June 2025
30 Jun 2026	11541.3 µg/m³	–
1 Jul 2026	11440.9 µg/m³	–
7 Jun 2025	10537.2 µg/m³	Northern United States and Canada, May and June 2025
29 Jun 2026	8929.7 µg/m³	–
28 Jul 2025	8829.2 µg/m³	–
19 Jul 2025	8728.3 µg/m³	–
10 Aug 2025	8225.8 µg/m³	–
16 Aug 2026	8225.8 µg/m³	–
27 Jul 2025	7823.6 µg/m³	–

Daily means, the highest since 30 Apr 2025; 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, Sept-Îles, Canada, 30 Apr 2025 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ca/sept-iles/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.

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

Updated 2026-10-12 20:07 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).