SmogRank / Thailand / Bangkok / Ban Samae Dam

Ban Samae Dam, month by month

Ban Samae Dam has a measured daily mean on 808 days since 1 January 2023. Its worst month was January 2024, at 134 US AQI (48.8 µg/m³), 36th of 2,385 cities on that month's world ranking. Its cleanest was June 2026, at 59 US AQI (13.5 µg/m³).

Every month since 2023

202674 so far257 days measured325th of 2,798 in the world
Jan99#123Feb88#271Mar82#405Apr80#309May64#381Jun59#400Jul3 daysAug61#405Sep62#377Oct78#64
2025too few days for a mean (a year needs 256)245 days measured
Jan131#38Feb100#150Mar20 daysApr71#358May66#333Jun67#297JulnoneAug6 daysSep63#319Oct10 daysNov12 daysDec92#296
2024too few days for a mean (a year needs 257)225 days measured
Jan134#36Feb105#71Mar4 daysApr82#112May79#102Jun9 daysJulnoneAugnoneSep10 daysOct83#47Nov88#74Dec100#59
2023too few days for a mean (a year needs 256)81 days measured
Jan102#38Feb2 daysMar9 daysApr19 daysMay10 daysJun7 daysJul5 daysAug3 daysSep3 daysOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Ban Samae Dam'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 Ban Samae Dam 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

22 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.
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.
Mar 202520 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Sep 202410 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks.
Aug 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 20249 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks.
Mar 20244 of 31 days measured; a month needs 22. The others: 27 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 20233 of 31 days measured; a month needs 22. The others: 28 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 20237 of 30 days measured; a month needs 21. The others: 23 with under 18 hours of readings or readings that failed our checks.
May 202310 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Apr 202319 of 30 days measured; a month needs 21. The others: 2 missing from OpenAQ's archive, 9 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.

Ban Samae Dam's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2024 13448.8 µg/m³25 of 3136thof 2,385–
January 2025 13147.6 µg/m³31 of 3138thof 2,474Northern Thailand, January 2025
February 2024 10537.0 µg/m³26 of 2971stof 2,486Thailand, February 2024
January 2023 10236.1 µg/m³23 of 3138thof 1,261Northern Thailand and Laos, January and February 2023
December 2024 10035.4 µg/m³31 of 3159thof 2,616–
February 2025 10035.3 µg/m³28 of 28150thof 2,633–

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.

Ban Samae Dam's worst days

DayUS AQIEpisode
1 Feb 2023 17488.5 µg/m³Northern Thailand and Laos, January and February 2023
23 Jan 2025 16879.9 µg/m³Northern Thailand, January 2025
24 Jan 2025 16879.8 µg/m³Northern Thailand, January 2025
14 Feb 2024 16879.2 µg/m³Thailand, February 2024
22 Jan 2025 16879.1 µg/m³–
15 Feb 2024 16473.8 µg/m³Thailand, February 2024
9 Jan 2025 16372.9 µg/m³–
19 Jan 2024 16372.7 µg/m³–
21 Jan 2025 16270.9 µg/m³–
13 Feb 2024 16170.1 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, Ban Samae Dam, Thailand, 1 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/ban-samae-dam/history (accessed 13 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.

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

Updated 2026-10-13 00:07 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).