SmogRank / Acharnés / Thessaloníki
Acharnés vs Thessaloníki: PM2.5 compared
Over the last year, Thessaloníki's air was 21% more polluted than Acharnés's: PM2.5 averaged 17.9 µg/m³ against 14.8, on the 74 days both cities were measured. Thessaloníki had the dirtier air on 46 of those days, Acharnés on 25. Thessaloníki was over the WHO's daily guideline of 15 µg/m³ on 37 of them, Acharnés on 28.
Right now
The last year, day by day
Month by month
Year by year
| Year | Acharnés | Thessaloníki | Days Acharnés was worse |
|---|---|---|---|
| 2026 so far | 63 | 63 | 22 |
| 2025 | 63 | 69 | 65 |
| 2024 | 62 | 67 | 71 |
| 2023 | 66 | 67 | 163 |
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
Thessaloníki
- 19 Dec 202515155.8 µg/m³
- 16 Dec 202511641.5 µg/m³
- 11 Dec 202510436.9 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).
Thessaloníki
Side by side with Pylaía (the nearest), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Acharnés and Thessaloníki, 10 Oct 2025 – 9 Oct 2026, smogrank.com/compare/gr-acharnes/gr-thessaloniki (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).