SmogRank / World / Greece / Attica / January 2023

Most unhealthy days in Attica, Greece, January 2023

5 cities in Attica, Greece ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Athens, Greece, 8 of 26 measured days. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 7 of these 31 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Athens 31% 30%0
Every city in Attica, Greece ranked for January 2023, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Athens
    8 of 26
  2. 2Acharnés
    6 of 27
  3. 3Asprópyrgos
    0 of 28
  4. 4Piraeus
    0 of 29
  5. 5Khalándrion
    0 of 28
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

All cities in the world, January 2023 · All cities in Greece, January 2023 · Attica now

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SmogRank, most polluted cities in Attica, Greece, by unhealthy days, PM2.5, January 2023, smogrank.com/gr/region/attica/history/2023-01?by=days (accessed 7 Oct 2026).

Download top 10 by average (PNG)

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.