SmogRank / Greece / Attica / Asprópyrgos

Asprópyrgos, month by month

Asprópyrgos has a measured daily mean on 1,030 days since 1 January 2023. Its worst month was July 2023, at 77 US AQI (22.8 µg/m³), 65th of 1,432 cities on that month's world ranking. Its cleanest was August 2025, at 46 US AQI (8.3 µg/m³).

Every month since 2023

202655 so far202 days measured822nd of 2,791 in the world
Jan20 daysFeb57#990Mar58#1,092Apr54#857May47#1,183Jun13 daysJul12 daysAug55#622Sep20 daysOct53#582
2025too few days for a mean (a year needs 256)254 days measured
Jan72#284Feb60#925Mar61#1,004Apr17 daysMay51#1,031Jun18 daysJul53#1,176Aug46#1,720Sep15 daysOct11 daysNov51#1,182Dec18 days
2024too few days for a mean (a year needs 257)222 days measured
Jan65#383Feb71#209Mar15 daysApr61#452May21 daysJun18 daysJul62#187Aug14 daysSepnoneOctnoneNov15 daysDec62#455
202364 for the year352 days measured102nd of 1,355 in the world
Jan67#186Feb73#119Mar61#98Apr57#240May59#192Jun59#473Jul77#65Aug62#191Sep65#141Oct67#88Nov60#189Dec68#191
Each square is a month's mean PM2.5 in US AQI from Asprópyrgos'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 Asprópyrgos 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

16 months
MonthWhy
Sep 202620 of 30 days measured; a month needs 21. The others: 10 with readings for part of the day (a day needs 18 hours).
Jul 202612 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks.
Jun 202613 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks.
Jan 202620 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Dec 202518 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Oct 202511 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Sep 202515 of 30 days measured; a month needs 21. The others: 15 with under 18 hours of readings or readings that failed our checks.
Jun 202518 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
Apr 202517 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks.
Nov 202415 of 30 days measured; a month needs 21. The others: 15 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 202414 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Jun 202418 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
May 202421 of 31 days measured; a month needs 22. The others: 10 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.

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

Asprópyrgos's worst months

MonthUS AQIDays measuredWorld rankEpisode
July 2023 7722.8 µg/m³29 of 3165thof 1,432–
February 2023 7320.7 µg/m³28 of 28119thof 1,129Europe, 6 to 25 February 2023
January 2025 7220.6 µg/m³24 of 31284thof 2,474–
February 2024 7119.6 µg/m³27 of 29209thof 2,486–
December 2023 6818.4 µg/m³30 of 31191stof 2,247–
January 2023 6717.9 µg/m³28 of 31186thof 1,261–

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.

Asprópyrgos's worst days

DayUS AQIEpisode
19 Jul 2023 16170.2 µg/m³–
14 Mar 2025 15967.0 µg/m³–
21 Jul 2023 15459.1 µg/m³–
24 Apr 2024 12143.6 µg/m³–
20 Jul 2023 10436.7 µg/m³–
22 Jul 2023 10135.7 µg/m³–
17 Feb 2023 10135.5 µg/m³Europe, 6 to 25 February 2023
23 Sept 2023 9934.9 µg/m³–
22 Sept 2023 9633.4 µg/m³–
16 Feb 2023 9532.7 µg/m³Europe, 6 to 25 February 2023

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, Asprópyrgos, Greece, 1 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/gr/aspropyrgos/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.

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

Updated 2026-10-12 20:07 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).