SmogRank / Portugal / Setúbal / Santo André

Santo André, month by month

Santo André, Setúbal has a measured daily mean on 467 days since 1 January 2023. Its worst month was February 2024, at 58 US AQI (12.9 µg/m³), 413th of 2,486 cities on that month's world ranking. Its cleanest was May 2024, at 38 US AQI (6.8 µg/m³).

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)76 days measured
Jan52#1,099Feb44#1,586Mar19 daysApr4 daysMay2 daysJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2024too few days for a mean (a year needs 257)221 days measured
Jan55#742Feb58#413Mar6 daysApr5 daysMay38#1,763Jun51#847Jul44#1,390Aug15 daysSepnoneOct14 daysNov52#946Dec18 days
2023too few days for a mean (a year needs 256)170 days measured
Jan21 daysFeb2 daysMar11 daysApr44#823May21 daysJunnoneJul14 daysAugnoneSepnoneOct13 daysNov53#580Dec52#850
Each square is a month's mean PM2.5 in US AQI from Santo André'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 Santo André 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 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. The others: 4 with readings for part of the day (a day needs 18 hours), 27 with readings left out by our checks.
Nov 2025No day measured. The others: 7 with readings for part of the day (a day needs 18 hours), 23 with readings left out by our checks.
Oct 2025No day measured. The others: 11 with readings for part of the day (a day needs 18 hours), 20 with readings left out by our checks.
Sep 2025No day measured. The others: 3 with readings for part of the day (a day needs 18 hours), 27 with readings left out by our checks.
Aug 2025No day measured. The others: 2 with readings for part of the day (a day needs 18 hours), 29 with readings left out by our checks.
Jul 2025No day measured. The others: 7 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours), 19 with readings left out by our checks.
Jun 2025No day measured. The others: 5 with no readings from the monitor, 11 with readings for part of the day (a day needs 18 hours), 14 with readings left out by our checks.
May 20252 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 7 with readings for part of the day (a day needs 18 hours), 21 with readings left out by our checks.
Apr 20254 of 30 days measured; a month needs 21. The others: 4 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours), 18 with readings left out by our checks.
Mar 202519 of 31 days measured; a month needs 22. The others: 12 with readings for part of the day (a day needs 18 hours).
Dec 202418 of 31 days measured; a month needs 22. The others: 6 with readings for part of the day (a day needs 18 hours), 7 with readings left out by our checks.
Oct 202414 of 31 days measured; a month needs 22. The others: 17 with readings for part of the day (a day needs 18 hours).
Sep 2024No day measured. The others: 30 with readings for part of the day (a day needs 18 hours).
Aug 202415 of 31 days measured; a month needs 22. The others: 3 with no readings from the monitor, 13 with readings for part of the day (a day needs 18 hours).
Apr 20245 of 30 days measured; a month needs 21. The others: 3 with readings for part of the day (a day needs 18 hours), 22 with readings left out by our checks.
Mar 20246 of 31 days measured; a month needs 22. The others: 14 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours), 5 with readings left out by our checks.
Oct 202313 of 31 days measured; a month needs 22. The others: 16 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).
Sep 2023No day measured. The others: 30 with no readings from the monitor.
Aug 2023No day measured. The others: 31 with no readings from the monitor.
Jul 202314 of 31 days measured; a month needs 22. The others: 11 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours), 1 missing from OpenAQ's archive.
Jun 2023No day measured. The others: 27 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours).
May 202321 of 31 days measured; a month needs 22. The others: 4 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours).
Mar 202311 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive.
Feb 20232 of 28 days measured; a month needs 20. The others: 1 with no readings from the monitor, 25 missing from OpenAQ's archive.
Jan 202321 of 31 days measured; a month needs 22. The others: 3 with readings for part of the day (a day needs 18 hours), 7 missing from OpenAQ's archive.

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

Santo André's worst months

MonthUS AQIDays measuredWorld rank
February 2024 5812.9 µg/m³25 of 29413thof 2,486
January 2024 5511.5 µg/m³31 of 31742ndof 2,385
November 2023 5310.2 µg/m³30 of 30580thof 2,243
November 2024 529.5 µg/m³25 of 30946thof 2,624
December 2023 529.4 µg/m³31 of 31850thof 2,247
January 2025 529.4 µg/m³28 of 311,099thof 2,474

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.

Santo André's worst days

DayUS AQI
18 Dec 2024 9231.3 µg/m³
14 Jan 2024 8125.2 µg/m³
29 Nov 2024 8024.9 µg/m³
19 Feb 2024 7622.7 µg/m³
5 Feb 2024 7522.1 µg/m³
8 Nov 2024 7421.7 µg/m³
15 Jan 2024 7421.2 µg/m³
28 Jan 2024 7120.1 µg/m³
25 Nov 2023 7119.6 µg/m³
2 Feb 2024 7119.6 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, Santo André, Setúbal, Portugal, 1 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/pt/santo-andre-setubal/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.

Santo André 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).