SmogRank / Thailand / Chanthaburi / Chanthaburi

Chanthaburi, month by month

Chanthaburi has a measured daily mean on 690 days since 1 January 2023. Its worst month was February 2025, at 96 US AQI (33.2 µg/m³), 179th of 2,633 cities on that month's world ranking. Its cleanest was August 2026, at 39 US AQI (7.0 µg/m³).

Every month since 2023

202661 so far215 days measured593rd of 2,791 in the world
Jan77#301Feb73#514Mar20 daysApr68#440May56#600Jun52#699Jul1 dayAug39#2,099Sep48#847Oct56#369
2025too few days for a mean (a year needs 256)211 days measured
Jan5 daysFeb96#179Mar83#397Apr59#633May47#1,206Jun53#1,264JulnoneAug6 daysSep41#1,562Oct10 daysNov12 daysDec57#914
2024too few days for a mean (a year needs 257)180 days measured
Jan86#127Feb79#147Mar16 daysApr66#323May54#609Jun51#879Jul17 daysAug17 daysSep4 daysOct2 daysNov2 daysDecnone
2023too few days for a mean (a year needs 256)84 days measured
Jan71#151Feb2 daysMar9 daysApr17 daysMay14 daysJun10 daysJul5 daysAug2 daysSep3 daysOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Chanthaburi'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 Chanthaburi marked; each year, the year's. A dashed square is the running month, so far.
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

25 months
MonthWhy
Jul 20261 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 202620 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Nov 202512 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks.
Oct 202510 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Aug 20256 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Jul 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jan 20255 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Dec 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 20242 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
Oct 20242 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Sep 20244 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks.
Aug 202417 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Jul 202417 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Mar 202416 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Dec 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 20233 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Aug 20232 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Jul 20235 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 25 with under 18 hours of readings or readings that failed our checks.
Jun 202310 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks.
May 202314 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Apr 202317 of 30 days measured; a month needs 21. The others: 2 missing from OpenAQ's archive, 11 with under 18 hours of readings or readings that failed our checks.
Mar 20239 of 31 days measured; a month needs 22. The others: 19 missing from OpenAQ's archive, 3 with under 18 hours of readings or readings that failed our checks.
Feb 20232 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 1 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.

Chanthaburi's worst months

MonthUS AQIDays measuredWorld rankEpisode
February 2025 9633.2 µg/m³28 of 28179thof 2,633Thailand, 12 to 13 February 2025
January 2024 8628.1 µg/m³23 of 31127thof 2,385–
March 2025 8326.3 µg/m³28 of 31397thof 2,862Thailand and Laos, March 2025
February 2024 7924.2 µg/m³23 of 29147thof 2,486Thailand, February 2024
January 2026 7723.1 µg/m³28 of 31301stof 2,617–
February 2026 7321.1 µg/m³24 of 28514thof 2,866–

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.

Chanthaburi's worst days

DayUS AQIEpisode
25 Jan 2025 15156.0 µg/m³Northern Thailand, January 2025
24 Jan 2025 15155.6 µg/m³Northern Thailand, January 2025
13 Feb 2025 15155.6 µg/m³Thailand, 12 to 13 February 2025
24 Mar 2025 14452.9 µg/m³Thailand and Laos, March 2025
15 Feb 2024 14051.4 µg/m³Thailand, February 2024
23 Mar 2025 14051.2 µg/m³Thailand and Laos, March 2025
14 Feb 2025 13448.8 µg/m³–
26 Jan 2025 13348.6 µg/m³Northern Thailand, January 2025
21 Apr 2023 13047.3 µg/m³Thailand, April 2023
14 Feb 2024 13047.1 µg/m³Thailand, February 2024

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, Chanthaburi, Thailand, 1 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/chanthaburi/history (accessed 12 Oct 2026).

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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.

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

Updated 2026-10-12 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 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).