SmogRank / Portugal / Faro / Faro

Faro, month by month

Faro has a measured daily mean on 1,027 days since 1 January 2023. Its worst month was August 2023, at 21 US AQI (3.8 µg/m³), 1,935th of 1,980 cities on that month's world ranking. Its cleanest was April 2025, at 9 US AQI (1.7 µg/m³). 2025 averaged 14 US AQI (2.6 µg/m³), against 16 US AQI (2.9 µg/m³) in 2024.

Every month since 2023

2026too few days for a mean (a year needs 199)175 days measured
Jan13#2,599Feb16#2,822Mar17#2,921Apr14 daysMay13#2,855Jun16#2,438Jul16 daysAugnoneSep9 daysOct3 days
202514 for the year284 days measured2,678th of 2,681 in the world
Jan13#2,461Feb14#2,621Mar11#2,855Apr9#2,949May14#2,795Jun7 daysJul16#2,853Aug21#2,831Sep14#3,081Oct17 daysNov11#2,711Dec13#2,979
202416 for the year261 days measured2,093rd of 2,097 in the world
Jan21#2,280Feb18#2,404Mar15 daysApr17#2,430May15#2,616Jun17#2,488Jul15#2,546Aug14 daysSepnoneOct15 daysNov19 daysDec12#2,599
202319 for the year307 days measured1,344th of 1,355 in the world
Jan16#1,235Feb18 daysMar16#893Apr18#1,547May19#1,558Jun21#1,523Jul18#1,382Aug21#1,935Sep18 daysOct10 daysNov18#2,181Dec20#2,171
Each square is a month's mean PM2.5 in US AQI from Faro'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 Faro 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

15 months
MonthWhy
Oct 20263 of 11 days measured; a month needs 8. The others: 6 with no readings from the monitor, 2 with readings left out by our checks.
Sep 20269 of 30 days measured; a month needs 21. The others: 4 with readings for part of the day (a day needs 18 hours), 17 with under 18 hours of readings or readings that failed our checks.
Aug 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 202616 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Apr 202614 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks.
Oct 202517 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Jun 20257 of 30 days measured; a month needs 21. The others: 23 with under 18 hours of readings or readings that failed our checks.
Nov 202419 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
Oct 202415 of 31 days measured; a month needs 22. The others: 16 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 202414 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Mar 202415 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Oct 202310 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Sep 202318 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
Feb 202318 of 28 days measured; a month needs 20. The others: 10 missing from OpenAQ's archive.

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

Faro's worst months

MonthUS AQIDays measuredWorld rank
August 2023 213.8 µg/m³27 of 311,935thof 1,980
June 2023 213.7 µg/m³30 of 301,523rdof 1,603
January 2024 213.7 µg/m³31 of 312,280thof 2,385
August 2025 213.7 µg/m³31 of 312,831stof 2,901
December 2023 203.6 µg/m³31 of 312,171stof 2,247
May 2023 193.5 µg/m³31 of 311,558thof 1,600

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.

Faro's worst days

DayUS AQI
22 Feb 2023 519.2 µg/m³
6 Aug 2023 498.8 µg/m³
28 Jan 2024 427.5 µg/m³
30 Dec 2023 407.2 µg/m³
21 Feb 2023 397.1 µg/m³
10 Apr 2023 397.0 µg/m³
31 Dec 2023 397.0 µg/m³
29 Dec 2023 376.7 µg/m³
20 May 2023 376.6 µg/m³
28 Jun 2023 366.4 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, Faro, Portugal, 1 Jan 2023 – 3 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/pt/faro/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.

Faro 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).