Acharnés vs Grevená: PM2.5 compared

Over the last year, Acharnés's air was about 1.7× as polluted as Grevená's: PM2.5 averaged 13.7 µg/m³ against 8.0, on the 160 days both cities were measured. Acharnés had the dirtier air on 149 of those days, Grevená on 10. Acharnés was over the WHO's daily guideline of 15 µg/m³ on 47 of them, Grevená on 5.

Right now

Acharnés–not on the 24-hour board right now

Grevená#2,091on the 24-hour board of 2,748, at 19 US AQI (3.5 µg/m³)

The last year, day by day

Acharnés

Grevená

Each city's daily mean from 10 Oct 2025 to 9 Oct 2026, one stripe a day, coloured by band. A blank stripe is a day without a daily mean.

Month by month

Monthly means in µg/m³ over the days both cities were measured. Solid: Acharnés. Faded: Grevená. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

Year	Acharnés	Grevená	Days both measured	Days Acharnés was worse
2026 so far	59	42	131	126
2025	61	54	65	48

Means in US AQI over the days both cities were measured that year; a year shows once they share 30 such days.

Each city's worst days

Acharnés

19 Dec 202511943.0 µg/m³
15 Feb 202610637.6 µg/m³
30 Dec 20259733.8 µg/m³

Grevená

30 Dec 20257622.4 µg/m³
19 Dec 20257220.3 µg/m³
10 Dec 20257019.1 µg/m³

Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.

Compare either city with another

Acharnés

Side by side with Thrakomakedónes (the nearest), Asprópyrgos (Greece's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).

Grevená

Side by side with Kozáni (the nearest), Gujranwala (the world's worst on 30 days).

Use this page

SmogRank, PM2.5 daily means compared, Acharnés and Grevená, 10 Oct 2025 – 9 Oct 2026, smogrank.com/compare/gr-acharnes/gr-grevena (accessed 10 Oct 2026).

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.

The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.

Updated 2026-10-10 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 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).