SmogRank / Reunion / Reunion / Saint-Paul

Saint-Paul, month by month

Saint-Paul, Reunion has a measured daily mean on 371 days since 11 January 2023. Its worst month was February 2024, at 32 US AQI (5.8 µg/m³), 1,898th of 2,486 cities on that month's world ranking. Its cleanest was November 2023, at 16 US AQI (2.9 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)12 days measured
Jan3 daysFebnoneMarnoneAprnoneMay2 daysJun1 dayJulnoneAugnoneSep1 dayOct5 days
2025too few days for a mean (a year needs 256)0 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2024too few days for a mean (a year needs 257)62 days measured
Jan22#2,250Feb32#1,898Mar10 daysApr2 daysMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
202322 for the year297 days measured1,326th of 1,355 in the world
Jan7 daysFeb26#1,073Mar26#823Apr24#1,445May20#1,551Jun19#1,539Jul23#1,312Aug14 daysSep19 daysOct26#1,841Nov16#2,207Dec23#2,126
Each square is a month's mean PM2.5 in US AQI from Saint-Paul'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-Paul 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

35 months
MonthWhy
Oct 20265 of 12 days measured; a month needs 9. The others: 7 with readings for part of the day (a day needs 18 hours).
Sep 20261 of 30 days measured; a month needs 21. The others: 29 with readings for part of the day (a day needs 18 hours).
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 20261 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks.
May 20262 of 31 days measured; a month needs 22. The others: 29 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.
Mar 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2026No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 20263 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
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 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 20242 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
Mar 202410 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Sep 202319 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
Aug 202314 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Jan 20237 of 31 days measured; a month needs 22. The others: 14 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-Paul's worst months

MonthUS AQIDays measuredWorld rank
February 2024 325.8 µg/m³27 of 291,898thof 2,486
February 2023 264.7 µg/m³28 of 281,073rdof 1,129
March 2023 264.7 µg/m³30 of 31823rdof 911
October 2023 264.6 µg/m³22 of 311,841stof 2,012
April 2023 244.3 µg/m³30 of 301,445thof 1,622
July 2023 234.2 µg/m³25 of 311,312thof 1,432

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-Paul's worst days

DayUS AQI
3 Mar 2024 6516.7 µg/m³
11 Feb 2024 6416.3 µg/m³
4 Jul 2023 5511.4 µg/m³
12 Feb 2024 5511.0 µg/m³
31 Mar 2023 519.3 µg/m³
5 Jul 2023 519.2 µg/m³
4 Mar 2024 498.8 µg/m³
20 Sept 2023 488.7 µg/m³
19 Oct 2023 488.7 µg/m³
23 Feb 2024 468.2 µg/m³

Daily means, the highest since 11 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, Saint-Paul, Reunion, Reunion, 11 Jan 2023 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/re/saint-paul/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-Paul now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-13 01:07 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).