SmogRank / Portugal / Setúbal / Corroios

Corroios, month by month

Corroios has a measured daily mean on 410 days since 11 January 2023. Its worst month was February 2023, at 48 US AQI (8.6 µg/m³), 766th of 1,129 cities on that month's world ranking. Its cleanest was September 2023, at 18 US AQI (3.2 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)23 days measured
Jan4 daysFeb2 daysMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSep9 daysOct25#2,322
2025too few days for a mean (a year needs 256)2 days measured
JannoneFebnoneMarnoneAprnoneMay1 dayJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDec1 day
2024too few days for a mean (a year needs 257)71 days measured
Jan42#1,344Feb41#1,367Mar8 daysApr2 daysMay2 daysJun1 dayJul1 dayAugnoneSepnoneOctnoneNovnoneDecnone
202328 for the year314 days measured1,255th of 1,355 in the world
Jan7 daysFeb48#766Mar30#776Apr23#1,463May24#1,497Jun29#1,394Jul20#1,364Aug21 daysSep18#2,144Oct28#1,771Nov23#2,114Dec41#1,434
Each square is a month's mean PM2.5 in US AQI from Corroios'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 Corroios 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

33 months
MonthWhy
Sep 20269 of 30 days measured; a month needs 21. The others: 2 with readings for part of the day (a day needs 18 hours), 19 with readings left out by our checks.
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 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2026No day measured. The others: 31 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 20262 of 28 days measured; a month needs 20. The others: 26 with under 18 hours of readings or readings that failed our checks.
Jan 20264 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Dec 20251 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Nov 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 20251 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Apr 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2025No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
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 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Jun 20241 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks.
May 20242 of 31 days measured; a month needs 22. The others: 29 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 20248 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
Aug 202321 of 31 days measured; a month needs 22. The others: 10 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.

Corroios's worst months

MonthUS AQIDays measuredWorld rank
February 2023 488.6 µg/m³28 of 28766thof 1,129
January 2024 427.6 µg/m³31 of 311,344thof 2,385
December 2023 417.4 µg/m³31 of 311,434thof 2,247
February 2024 417.3 µg/m³26 of 291,367thof 2,486
March 2023 305.4 µg/m³30 of 31776thof 911
June 2023 295.3 µg/m³27 of 301,394thof 1,603

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.

Corroios's worst days

DayUS AQI
2 Feb 2023 7723.3 µg/m³
3 Feb 2023 7421.7 µg/m³
21 Feb 2023 7321.0 µg/m³
3 Mar 2023 7220.2 µg/m³
25 Dec 2023 6918.9 µg/m³
5 Feb 2023 6818.3 µg/m³
5 Feb 2024 6717.9 µg/m³
8 Jan 2024 6717.6 µg/m³
24 Dec 2023 6617.3 µg/m³
4 Feb 2023 6617.2 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, Corroios, Portugal, 11 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/corroios/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.

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

Updated 2026-10-12 18:07 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).