SmogRank / Thailand / Chon Buri / Laem Chabang

Laem Chabang, month by month

Laem Chabang has a measured daily mean on 644 days since 25 January 2023. Its worst month was January 2024, at 107 US AQI (37.9 µg/m³), 75th of 2,385 cities on that month's world ranking. Its cleanest was September 2025, at 44 US AQI (8.0 µg/m³).

Every month since 2023

202662 so far214 days measured552nd of 2,793 in the world
Jan6 daysFeb14 daysMar74#549Apr71#413May61#432Jun56#506Jul3 daysAug46#1,481Sep53#657Oct61#229
2025too few days for a mean (a year needs 256)184 days measured
Jan5 daysFeb96#179Mar79#447Apr62#540May21 daysJun54#1,118JulnoneAug6 daysSep44#1,244Oct10 daysNovnoneDec10 days
2024too few days for a mean (a year needs 257)182 days measured
Jan107#75Feb20 daysMar20 daysApr64#364May70#162Jun51#847Jul15 daysAug16 daysSep4 daysOct2 daysNov2 daysDec1 day
2023too few days for a mean (a year needs 256)64 days measured
Jan5 daysFeb1 dayMar8 daysApr17 daysMay15 daysJun9 daysJul4 daysAug2 daysSep3 daysOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Laem Chabang'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 Laem Chabang 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

30 months
MonthWhy
Jul 20263 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Feb 202614 of 28 days measured; a month needs 20. The others: 14 with under 18 hours of readings or readings that failed our checks.
Jan 20266 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Dec 202510 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Nov 2025No day measured. The others: 30 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.
May 202521 of 31 days measured; a month needs 22. The others: 10 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 20241 of 31 days measured; a month needs 22. The others: 30 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 202416 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Jul 202415 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Mar 202420 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Feb 202420 of 29 days measured; a month needs 21. The others: 1 missing from OpenAQ's archive, 8 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 20234 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 26 with under 18 hours of readings or readings that failed our checks.
Jun 20239 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks.
May 202315 of 31 days measured; a month needs 22. The others: 16 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 20238 of 31 days measured; a month needs 22. The others: 19 missing from OpenAQ's archive, 4 with under 18 hours of readings or readings that failed our checks.
Feb 20231 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 2 with under 18 hours of readings or readings that failed our checks.
Jan 20235 of 31 days measured; a month needs 22. The others: 2 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.

Laem Chabang's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2024 10737.9 µg/m³24 of 3175thof 2,385–
February 2025 9633.2 µg/m³28 of 28179thof 2,633Thailand, 12 to 13 February 2025
March 2025 7924.0 µg/m³24 of 31447thof 2,862Thailand and Laos, March 2025
March 2026 7421.4 µg/m³31 of 31549thof 2,971–
April 2026 7119.6 µg/m³30 of 30413thof 2,941–
May 2024 7019.5 µg/m³25 of 31162ndof 2,684Thailand and Laos, April and May 2024

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.

Laem Chabang's worst days

DayUS AQIEpisode
24 Jan 2025 16068.1 µg/m³Northern Thailand, January 2025
13 Feb 2025 15865.0 µg/m³Thailand, 12 to 13 February 2025
25 Jan 2025 15763.9 µg/m³Northern Thailand, January 2025
14 Feb 2024 15257.1 µg/m³Thailand, February 2024
16 Apr 2023 14553.4 µg/m³Thailand, April 2023
15 Feb 2024 14151.6 µg/m³Thailand, February 2024
1 Feb 2025 14051.5 µg/m³–
23 Mar 2025 13850.4 µg/m³Thailand and Laos, March 2025
20 Jan 2024 13750.3 µg/m³–
28 Jan 2024 13649.9 µg/m³–

Daily means, the highest since 25 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, Laem Chabang, Thailand, 25 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/laem-chabang/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.

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

Updated 2026-10-12 21:07 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).