SmogRank / Greece / Central Macedonia / Thessaloníki

Thessaloníki, month by month

Thessaloníki has a measured daily mean on 864 days since 1 January 2023. Its worst month was January 2025, at 98 US AQI (34.4 µg/m³), 70th of 2,474 cities on that month's world ranking. Its cleanest was August 2025, at 52 US AQI (9.6 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)66 days measured
Jan19 daysFeb65#715Mar14 daysAprnoneMaynoneJunnoneJulnoneAug5 daysSep5 daysOct3 days
2025too few days for a mean (a year needs 256)246 days measured
Jan98#70Feb18 daysMar21 daysApr19 daysMay19 daysJun5 daysJul55#1,051Aug52#1,329Sep53#665Oct16 daysNov74#377Dec78#396
2024too few days for a mean (a year needs 257)221 days measured
Jan86#128Feb76#171Mar13 daysApr58#583May52#772Jun54#479Jul58#333Aug12 daysSepnoneOctnoneNov15 daysDec81#140
202367 for the year331 days measured92nd of 1,355 in the world
Jan76#115Feb83#40Mar63#76Apr58#211May9 daysJun55#625Jul58#294Aug58#268Sep62#181Oct64#106Nov69#87Dec94#54
Each square is a month's mean PM2.5 in US AQI from Thessaloníki'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 Thessaloníki marked; each year, the year's.
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

21 months
MonthWhy
Oct 20263 of 12 days measured; a month needs 9. The others: 9 with readings for part of the day (a day needs 18 hours).
Sep 20265 of 30 days measured; a month needs 21. The others: 6 with no readings from the monitors, 18 with readings for part of the day (a day needs 18 hours), 1 with under 18 hours of readings or readings that failed our checks.
Aug 20265 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Jul 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 202614 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Jan 202619 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Oct 202516 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Jun 20255 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks.
May 202519 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Apr 202519 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
Mar 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Feb 202518 of 28 days measured; a month needs 20. The others: 10 with under 18 hours of readings or readings that failed our checks.
Nov 202415 of 30 days measured; a month needs 21. The others: 15 with under 18 hours of readings or readings that failed our checks.
Oct 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 202412 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks.
Mar 202413 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
May 20239 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.

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

Thessaloníki's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2025 9834.4 µg/m³23 of 3170thof 2,474Germany, France and 19 more countries, January 2025
Europe, 24 December 2024 to 3 January 2025
December 2023 9432.3 µg/m³31 of 3154thof 2,247South-eastern Europe, 28 December 2023 to 1 January 2024
Romania, Bulgaria and 2 more countries, December 2023
January 2024 8627.9 µg/m³31 of 31128thof 2,385Europe, 27 January to 2 February 2024
Europe, 8 to 27 January 2024and 1 more
February 2023 8326.4 µg/m³26 of 2840thof 1,129Europe, 6 to 25 February 2023
December 2024 8125.2 µg/m³26 of 31140thof 2,616Europe, 24 December 2024 to 3 January 2025
Serbia, Slovenia and 10 more countries, December 2024
December 2025 7823.5 µg/m³27 of 31396thof 3,006Eastern Europe, 16 to 21 December 2025

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.

Thessaloníki's worst days

DayUS AQIEpisode
16 Mar 2025 15966.7 µg/m³–
1 Jan 2024 15865.0 µg/m³South-eastern Europe, 28 December 2023 to 1 January 2024
1 Jan 2025 15662.5 µg/m³Europe, 24 December 2024 to 3 January 2025
22 Jan 2025 15358.2 µg/m³Germany, France and 19 more countries, January 2025
15 Jan 2024 15257.1 µg/m³Europe, 8 to 27 January 2024
1 Jan 2023 15256.7 µg/m³Eastern Europe, January 2023
3 Jan 2023 15256.6 µg/m³Eastern Europe, January 2023
20 Dec 2024 15156.1 µg/m³Serbia, Slovenia and 10 more countries, December 2024
19 Dec 2025 15155.8 µg/m³Eastern Europe, 16 to 21 December 2025
3 Jan 2024 15055.3 µg/m³–

Daily means, the highest since 1 Jan 2023; 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, Thessaloníki, Greece, 1 Jan 2023 – 9 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/gr/thessaloniki/history (accessed 13 Oct 2026).

Download chart (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.

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

Updated 2026-10-13 01:07 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).