SmogRank / Portugal / Lisbon / Lourinhã

Lourinhã, month by month

Lourinhã has a measured daily mean on 290 days since 1 February 2023. Its worst month was February 2024, at 51 US AQI (9.2 µg/m³), 797th of 2,486 cities on that month's world ranking. Its cleanest was October 2023, at 26 US AQI (4.7 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)13 days measured
Jan2 daysFeb1 dayMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSep5 daysOct5 days
2025too few days for a mean (a year needs 256)1 day measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAug1 daySepnoneOctnoneNovnoneDecnone
2024too few days for a mean (a year needs 257)68 days measured
Jan47#1,116Feb51#797Mar8 daysApr3 daysMay1 dayJun2 daysJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2023too few days for a mean (a year needs 256)208 days measured
JanFeb2 daysMar10 daysApr17 daysMay28#1,419Jun26#1,443Jul21 daysAug5 daysSep11 daysOct26#1,827Nov28#1,948Dec41#1,434
Each square is a month's mean PM2.5 in US AQI from Lourinhã'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 Lourinhã 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

38 months
MonthWhy
Oct 20265 of 12 days measured; a month needs 9. The others: 1 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours), 3 with readings left out by our checks, 1 with under 18 hours of readings or readings that failed our checks.
Sep 20265 of 30 days measured; a month needs 21. The others: 25 with readings left out by our checks.
Aug 2026No day measured. The others: 3 with readings for part of the day (a day needs 18 hours), 28 with readings left out by our checks.
Jul 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.
Jun 2026No day measured. The others: 8 with readings for part of the day (a day needs 18 hours), 22 with readings left out by our checks.
May 2026No day measured. The others: 1 with readings for part of the day (a day needs 18 hours), 30 with readings left out by our checks.
Apr 2026No day measured. The others: 30 with readings left out by our checks.
Mar 2026No day measured. The others: 31 with readings left out by our checks.
Feb 20261 of 28 days measured; a month needs 20. The others: 3 with readings for part of the day (a day needs 18 hours), 24 with readings left out by our checks.
Jan 20262 of 31 days measured; a month needs 22. The others: 14 with readings for part of the day (a day needs 18 hours), 15 with readings left out by our checks.
Dec 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.
Nov 2025No day measured. The others: 1 with no readings from the monitor, 8 with readings for part of the day (a day needs 18 hours), 21 with readings left out by our checks.
Oct 2025No day measured. The others: 12 with readings for part of the day (a day needs 18 hours), 19 with readings left out by our checks.
Sep 2025No day measured. The others: 2 with readings for part of the day (a day needs 18 hours), 28 with readings left out by our checks.
Aug 20251 of 31 days measured; a month needs 22. The others: 30 with readings left out by our checks.
Jul 2025No day measured. The others: 31 with readings left out by our checks.
Jun 2025No day measured. The others: 10 with readings for part of the day (a day needs 18 hours), 20 with readings left out by our checks.
May 2025No day measured. The others: 1 with no readings from the monitor, 9 with readings for part of the day (a day needs 18 hours), 21 with readings left out by our checks.
Apr 2025No day measured. The others: 1 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours), 23 with readings left out by our checks.
Mar 2025No day measured. The others: 8 with readings for part of the day (a day needs 18 hours), 23 with readings left out by our checks.
Feb 2025No day measured. The others: 6 with readings for part of the day (a day needs 18 hours), 22 with readings left out by our checks.
Jan 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.
Dec 2024No 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 2024No 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.
Oct 2024No day measured. The others: 16 with readings for part of the day (a day needs 18 hours), 15 with readings left out by our checks.
Sep 2024No day measured. The others: 30 with readings for part of the day (a day needs 18 hours).
Aug 2024No day measured. The others: 3 with no readings from the monitor, 13 with readings for part of the day (a day needs 18 hours), 15 with readings left out by our checks.
Jul 2024No day measured. The others: 1 with readings for part of the day (a day needs 18 hours), 30 with readings left out by our checks.
Jun 20242 of 30 days measured; a month needs 21. The others: 1 with readings for part of the day (a day needs 18 hours), 27 with readings left out by our checks.
May 20241 of 31 days measured; a month needs 22. The others: 1 with readings for part of the day (a day needs 18 hours), 29 with readings left out by our checks.
Apr 20243 of 30 days measured; a month needs 21. The others: 2 with readings for part of the day (a day needs 18 hours), 25 with readings left out by our checks.
Mar 20248 of 31 days measured; a month needs 22. The others: 13 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours), 5 with readings left out by our checks.
Sep 202311 of 30 days measured; a month needs 21. The others: 14 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours).
Aug 20235 of 31 days measured; a month needs 22. The others: 7 with no readings from the monitor, 16 with readings for part of the day (a day needs 18 hours), 3 with readings left out by our checks.
Jul 202321 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), 1 with readings left out by our checks, 1 missing from OpenAQ's archive.
Apr 202317 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), 2 with readings left out by our checks, 3 missing from OpenAQ's archive.
Mar 202310 of 31 days measured; a month needs 22. The others: 1 with readings left out by our checks, 20 missing from OpenAQ's archive.
Feb 20232 of 28 days measured; a month needs 20. The others: 1 with readings left out by our checks, 25 missing from OpenAQ's archive.

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

Lourinhã's worst months

MonthUS AQIDays measuredWorld rankEpisode
February 2024 519.2 µg/m³25 of 29797thof 2,486Spain, Portugal and France, February 2024
January 2024 478.5 µg/m³29 of 311,116thof 2,385–
December 2023 417.4 µg/m³31 of 311,434thof 2,247–
May 2023 285.1 µg/m³31 of 311,419thof 1,600–
November 2023 285.1 µg/m³28 of 301,948thof 2,243–
June 2023 264.7 µg/m³27 of 301,443rdof 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.

Lourinhã's worst days

DayUS AQIEpisode
2 Feb 2024 8728.4 µg/m³Spain, Portugal and France, February 2024
6 Aug 2025 8627.8 µg/m³–
3 Feb 2024 7723.1 µg/m³–
5 Feb 2024 7321.1 µg/m³–
6 Feb 2024 6818.1 µg/m³–
22 Dec 2023 6717.8 µg/m³–
7 Feb 2024 6717.8 µg/m³–
6 Jan 2024 6617.3 µg/m³–
25 Dec 2023 6516.4 µg/m³–
22 Sept 2026 6416.1 µg/m³–

Daily means, the highest since 1 Feb 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, Lourinhã, Portugal, 1 Feb 2023 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/pt/lourinha/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.

Lourinhã 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).