SmogRank / Portugal / Setúbal / Sines

Sines, month by month

Sines has a measured daily mean on 709 days since 6 May 2023. Its worst month was August 2025, at 33 US AQI (6.0 µg/m³), 2,510th of 2,901 cities on that month's world ranking. Its cleanest was July 2023, at 16 US AQI (2.9 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)68 days measured
Jan15 daysFebnoneMarnoneAprnoneMaynoneJun2 daysJul14 daysAug18 daysSep19 daysOctnone
2025too few days for a mean (a year needs 256)190 days measured
Jan21#2,402Feb6 daysMar19 daysApr23#2,737May14 daysJun12 daysJul18 daysAug33#2,510Sep17#3,051Oct8 daysNovnoneDec17 days
2024too few days for a mean (a year needs 257)231 days measured
Jan24#2,208Feb9 daysMar14 daysApr26#2,089May20#2,505Jun24#2,346Jul19 daysAug13 daysSepnoneOct13 daysNov27#2,317Dec20#2,505
2023too few days for a mean (a year needs 256)220 days measured
JanFebMarAprMay28#1,419Jun24#1,466Jul16#1,400Aug20#1,946Sep22#2,103Oct29#1,696Nov24#2,087Dec19#2,182
Each square is a month's mean PM2.5 in US AQI from Sines'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 Sines 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

24 months
MonthWhy
Oct 2026No day measured. The others: 10 with no readings from the monitor, 1 with under 18 hours of readings or readings that failed our checks.
Sep 202619 of 30 days measured; a month needs 21. The others: 9 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours), 1 with readings left out by our checks.
Aug 202618 of 31 days measured; a month needs 22. The others: 4 with no readings from the monitor, 9 with readings for part of the day (a day needs 18 hours).
Jul 202614 of 31 days measured; a month needs 22. The others: 17 with readings for part of the day (a day needs 18 hours).
Jun 20262 of 30 days measured; a month needs 21. The others: 10 with readings for part of the day (a day needs 18 hours), 18 with readings left out by our checks.
May 2026No 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.
Apr 2026No day measured. The others: 1 with readings for part of the day (a day needs 18 hours), 29 with readings left out by our checks.
Mar 2026No day measured. The others: 5 with readings for part of the day (a day needs 18 hours), 26 with readings left out by our checks.
Feb 2026No day measured. The others: 1 with no readings from the monitor, 10 with readings for part of the day (a day needs 18 hours), 17 with readings left out by our checks.
Jan 202615 of 31 days measured; a month needs 22. The others: 11 with readings for part of the day (a day needs 18 hours), 5 with readings left out by our checks.
Dec 202517 of 31 days measured; a month needs 22. The others: 7 with readings for part of the day (a day needs 18 hours), 6 with readings left out by our checks, 1 with under 18 hours of readings or readings that failed our checks.
Nov 2025No day measured. The others: 12 with readings for part of the day (a day needs 18 hours), 18 with readings left out by our checks.
Oct 20258 of 31 days measured; a month needs 22. The others: 14 with readings for part of the day (a day needs 18 hours), 9 with readings left out by our checks.
Jul 202518 of 31 days measured; a month needs 22. The others: 7 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours).
Jun 202512 of 30 days measured; a month needs 21. The others: 5 with no readings from the monitor, 13 with readings for part of the day (a day needs 18 hours).
May 202514 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 9 with readings for part of the day (a day needs 18 hours), 7 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).
Feb 20256 of 28 days measured; a month needs 20. The others: 11 with no readings from the monitor, 11 with readings for part of the day (a day needs 18 hours).
Oct 202413 of 31 days measured; a month needs 22. The others: 18 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 202413 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 16 with readings for part of the day (a day needs 18 hours), 1 with readings left out by our checks.
Jul 202419 of 31 days measured; a month needs 22. The others: 7 with readings for part of the day (a day needs 18 hours), 5 with readings left out by our checks.
Mar 202414 of 31 days measured; a month needs 22. The others: 10 with no readings from the monitor, 7 with readings for part of the day (a day needs 18 hours).
Feb 20249 of 29 days measured; a month needs 21. The others: 2 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours), 15 with readings left out by our checks, 1 missing from OpenAQ's archive.

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

Sines's worst months

MonthUS AQIDays measuredWorld rank
August 2025 336.0 µg/m³26 of 312,510thof 2,901
October 2023 295.3 µg/m³26 of 311,696thof 2,012
May 2023 285.1 µg/m³26 of 311,419thof 1,600
November 2024 274.9 µg/m³25 of 302,317thof 2,624
April 2024 264.6 µg/m³27 of 302,089thof 2,520
June 2023 244.4 µg/m³30 of 301,466thof 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.

Sines's worst days

DayUS AQI
23 Feb 2024 10236.0 µg/m³
5 Feb 2024 7119.6 µg/m³
19 Dec 2024 6717.5 µg/m³
12 Aug 2025 6415.9 µg/m³
19 Feb 2024 5913.6 µg/m³
13 Aug 2025 5913.4 µg/m³
29 Nov 2024 5813.1 µg/m³
31 May 2025 5511.3 µg/m³
30 Jul 2025 5511.3 µg/m³
31 Jul 2025 5511.3 µg/m³

Daily means, the highest since 6 May 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, Sines, Portugal, 6 May 2023 – 20 Sep 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/pt/sines/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.

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

Updated 2026-10-12 19:07 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).