SmogRank / Greece / West Macedonia / Grevená

Grevená, month by month

Grevená has a measured daily mean on 315 days since 5 March 2025. Its worst month was December 2025, at 59 US AQI (13.5 µg/m³), 824th of 3,006 cities on that month's world ranking. Its cleanest was September 2026, at 38 US AQI (6.8 µg/m³).

Every month since 2025

2026too few days for a mean (a year needs 199)197 days measured

Jan55#977 Feb41#2,166 Mar47#2,035Apr2 daysMay15 daysJun19 daysJul14 daysAug53#830 Sep38#1,365 Oct35#1,624

2025too few days for a mean (a year needs 256)118 days measured

JanFebMar20 daysApr18 daysMay18 daysJunnoneJulnoneAugnoneSepnoneOct6 daysNov43#1,601 Dec59#824

Each square is a month's mean PM2.5 in US AQI from Grevená'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 Grevená 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

12 months

Month	Why
Jul 2026	14 of 31 days measured; a month needs 22. The others: 7 with no readings from the monitor, 10 with readings for part of the day (a day needs 18 hours).
Jun 2026	19 of 30 days measured; a month needs 21. The others: 6 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours).
May 2026	15 of 31 days measured; a month needs 22. The others: 16 with readings for part of the day (a day needs 18 hours).
Apr 2026	2 of 30 days measured; a month needs 21. The others: 4 with no readings from the monitor, 24 with readings for part of the day (a day needs 18 hours).
Oct 2025	6 of 31 days measured; a month needs 22. The others: 25 with readings for part of the day (a day needs 18 hours).
Sep 2025	No day measured. The others: 3 with no readings from the monitor, 27 with readings for part of the day (a day needs 18 hours).
Aug 2025	No day measured. The others: 31 with readings for part of the day (a day needs 18 hours).
Jul 2025	No day measured. The others: 28 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours).
Jun 2025	No day measured. The others: 30 with readings for part of the day (a day needs 18 hours).
May 2025	18 of 31 days measured; a month needs 22. The others: 3 with no readings from the monitor, 10 with readings for part of the day (a day needs 18 hours).
Apr 2025	18 of 30 days measured; a month needs 21. The others: 11 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Mar 2025	20 of 31 days measured; a month needs 22. The others: 7 with readings for part of the day (a day needs 18 hours).

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

Grevená's worst months

Month	US AQI	Days measured	World rank	Episode
December 2025	5913.5 µg/m³	30 of 31	824thof 3,006	–
January 2026	5511.2 µg/m³	24 of 31	977thof 2,617	Europe, January and February 2026
August 2026	5310.3 µg/m³	30 of 31	830thof 2,896	–
March 2026	478.4 µg/m³	28 of 31	2,035thof 2,971	–
November 2025	437.8 µg/m³	26 of 30	1,601stof 2,715	–
February 2026	417.3 µg/m³	27 of 28	2,166thof 2,866	Europe, January and February 2026

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.

Grevená's worst days

Day	US AQI	Episode
17 Mar 2025	15561.7 µg/m³	–
22 Jan 2026	8326.5 µg/m³	Europe, January and February 2026
16 Mar 2025	7924.0 µg/m³	–
15 Jan 2026	7722.8 µg/m³	Europe, January and February 2026
20 Dec 2025	7622.7 µg/m³	–
30 Dec 2025	7622.4 µg/m³	–
19 Dec 2025	7220.3 µg/m³	–
21 Dec 2025	7019.5 µg/m³	–
10 Dec 2025	7019.1 µg/m³	–
28 Aug 2026	6919.0 µg/m³	–

Daily means, the highest since 5 Mar 2025; 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, Grevená, Greece, 5 Mar 2025 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/gr/grevena/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.

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

Updated 2026-10-12 19:07 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).