SmogRank / Greece / Attica / Piraeus

Piraeus, month by month

Piraeus has a measured daily mean on 854 days since 1 January 2023. Its worst month was February 2023, at 66 US AQI (17.3 µg/m³), 222nd of 1,129 cities on that month's world ranking. Its cleanest was May 2024, at 52 US AQI (9.5 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)132 days measured
Jan11 daysFeb19 daysMar56#1,272Apr19 daysMay17 daysJun12 daysJul10 daysAug10 daysSep8 daysOct2 days
2025too few days for a mean (a year needs 256)173 days measured
Jan20 daysFeb18 daysMar18 daysApr10 daysMay11 daysJun7 daysJul16 daysAug21 daysSep14 daysOct9 daysNov13 daysDec16 days
2024too few days for a mean (a year needs 257)195 days measured
Jan59#582Feb59#405Mar13 daysApr56#724May52#853Jun56#371Jul16 daysAug10 daysSepnoneOctnoneNov14 daysDec21 days
202358 for the year354 days measured171st of 1,355 in the world
Jan65#211Feb66#222Mar56#160Apr52#478May54#358Jun55#625Jul59#233Aug54#487Sep57#293Oct58#150Nov56#347Dec66#221
Each square is a month's mean PM2.5 in US AQI from Piraeus'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 Piraeus 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

28 months
MonthWhy
Oct 20262 of 11 days measured; a month needs 8. The others: 9 with readings for part of the day (a day needs 18 hours).
Sep 20268 of 30 days measured; a month needs 21. The others: 22 with readings for part of the day (a day needs 18 hours).
Aug 202610 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Jul 202610 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Jun 202612 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks.
May 202617 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Apr 202619 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
Feb 202619 of 28 days measured; a month needs 20. The others: 9 with under 18 hours of readings or readings that failed our checks.
Jan 202611 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Dec 202516 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Nov 202513 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks.
Oct 20259 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Sep 202514 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks.
Aug 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jul 202516 of 31 days measured; a month needs 22. The others: 15 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.
May 202511 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Apr 202510 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks.
Mar 202518 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Feb 202518 of 28 days measured; a month needs 20. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jan 202520 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Dec 202421 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Nov 202414 of 30 days measured; a month needs 21. The others: 16 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 202410 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Jul 202416 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Mar 202413 of 31 days measured; a month needs 22. The others: 18 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.

Piraeus's worst months

MonthUS AQIDays measuredWorld rankEpisode
February 2023 6617.3 µg/m³28 of 28222ndof 1,129Europe, 6 to 25 February 2023
December 2023 6617.3 µg/m³31 of 31221stof 2,247South-eastern Europe, 28 December 2023 to 1 January 2024
January 2023 6516.7 µg/m³29 of 31211thof 1,261Eastern Europe, January 2023
July 2023 5913.6 µg/m³29 of 31233rdof 1,432–
January 2024 5913.3 µg/m³31 of 31582ndof 2,385South-eastern Europe, 28 December 2023 to 1 January 2024
February 2024 5913.2 µg/m³22 of 29405thof 2,486South-eastern Europe, February 2024

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.

Piraeus's worst days

DayUS AQIEpisode
24 Apr 2024 15662.3 µg/m³–
15 Feb 2026 12645.8 µg/m³–
16 Feb 2023 11340.5 µg/m³Europe, 6 to 25 February 2023
17 Feb 2023 11340.3 µg/m³Europe, 6 to 25 February 2023
25 Dec 2023 11039.3 µg/m³–
23 Aug 2023 10838.2 µg/m³–
3 Jan 2025 10537.0 µg/m³Europe, 24 December 2024 to 3 January 2025
1 Jan 2025 10436.9 µg/m³Europe, 24 December 2024 to 3 January 2025
1 Jan 2024 10336.2 µg/m³South-eastern Europe, 28 December 2023 to 1 January 2024
4 Jan 2025 9935.0 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, Piraeus, Greece, 1 Jan 2023 – 7 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/gr/piraeus/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.

Piraeus 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).