SmogRank / Greece / Attica / Acharnés

Acharnés, month by month

Acharnés has a measured daily mean on 845 days since 1 January 2023. Its worst month was January 2023, at 81 US AQI (25.2 µg/m³), 95th of 1,261 cities on that month's world ranking. Its cleanest was August 2025, at 56 US AQI (11.6 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)152 days measured
Jan9 daysFeb19 daysMar63#787Apr13 daysMay17 daysJun12 daysJul11 daysAug16 daysSep19 daysOct56#403
2025too few days for a mean (a year needs 256)152 days measured
Jan19 daysFeb16 daysMar63#893Apr10 daysMay11 daysJunnoneJul3 daysAug56#869Sep11 daysOct9 daysNov14 daysDec13 days
2024too few days for a mean (a year needs 257)211 days measured
Jan68#325Feb65#298Mar14 daysApr60#475May56#501Jun58#308Jul18 daysAug12 daysSepnoneOctnoneNov13 daysDec68#325
202366 for the year330 days measured95th of 1,355 in the world
Jan81#95Feb78#65Mar64#62Apr70#124May68#117Jun58#485Jul64#112Aug61#215Sep61#205Oct60#126Nov57#276Dec73#152
Each square is a month's mean PM2.5 in US AQI from Acharnés'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 Acharnés 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

24 months
MonthWhy
Sep 202619 of 30 days measured; a month needs 21. The others: 6 with readings for part of the day (a day needs 18 hours), 5 with under 18 hours of readings or readings that failed our checks.
Aug 202616 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Jul 202611 of 31 days measured; a month needs 22. The others: 20 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 202613 of 30 days measured; a month needs 21. The others: 17 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 20269 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Dec 202513 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Nov 202514 of 30 days measured; a month needs 21. The others: 16 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 202511 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks.
Jul 20253 of 31 days measured; a month needs 22. The others: 28 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 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.
Feb 202516 of 28 days measured; a month needs 20. The others: 12 with under 18 hours of readings or readings that failed our checks.
Jan 202519 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Nov 202413 of 30 days measured; a month needs 21. The others: 17 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 202412 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks.
Jul 202418 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Mar 202414 of 31 days measured; a month needs 22. The others: 17 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.

Acharnés's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2023 8125.2 µg/m³27 of 3195thof 1,261Eastern Europe, January 2023
February 2023 7823.6 µg/m³28 of 2865thof 1,129Europe, 6 to 25 February 2023
December 2023 7320.7 µg/m³31 of 31152ndof 2,247South-eastern Europe, 28 December 2023 to 1 January 2024
April 2023 7019.1 µg/m³30 of 30124thof 1,622–
December 2024 6818.4 µg/m³24 of 31325thof 2,616Europe, 24 December 2024 to 3 January 2025
May 2023 6818.2 µg/m³31 of 31117thof 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.

Acharnés's worst days

DayUS AQIEpisode
24 Apr 2024 16169.3 µg/m³–
1 Jan 2024 15459.7 µg/m³South-eastern Europe, 28 December 2023 to 1 January 2024
3 Jan 2023 15256.5 µg/m³Eastern Europe, January 2023
16 Feb 2023 13248.2 µg/m³Europe, 6 to 25 February 2023
2 Jan 2025 12545.4 µg/m³Europe, 24 December 2024 to 3 January 2025
31 Dec 2023 12344.5 µg/m³South-eastern Europe, 28 December 2023 to 1 January 2024
9 Jan 2023 12244.0 µg/m³–
1 Jan 2023 12143.5 µg/m³Eastern Europe, January 2023
19 Dec 2025 11943.0 µg/m³Eastern Europe, 16 to 21 December 2025
3 Jan 2025 11742.1 µg/m³Europe, 24 December 2024 to 3 January 2025

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, Acharnés, Greece, 1 Jan 2023 – 10 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/gr/acharnes/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.

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

Updated 2026-10-12 17:07 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).