Acharnés vs Kastoria: PM2.5 compared

Over the last year, Acharnés's air was about 1.6× as polluted as Kastoria's: PM2.5 averaged 11.8 µg/m³ against 7.2, on the 106 days both cities were measured. Acharnés had the dirtier air on 95 of those days, Kastoria on 11. Acharnés was over the WHO's daily guideline of 15 µg/m³ on 14 of them, Kastoria on 1.

Right now

Acharnés–not on the 24-hour board right now

Kastoria#2,226on the 24-hour board of 2,748, at 18 US AQI (3.2 µg/m³)

The last year, day by day

Acharnés

Kastoria

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: Kastoria. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

Year	Acharnés	Kastoria	Days both measured	Days Acharnés was worse
2026 so far	56	39	100	93
2025	56	51	53	36

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

28 Mar 20267120.1 µg/m³
19 Aug 20266918.6 µg/m³
22 Aug 20266717.8 µg/m³

Kastoria

19 Aug 20267320.8 µg/m³
18 Aug 20266114.4 µg/m³
29 Oct 20256114.3 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).

Kastoria

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

Use this page

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