SmogRank / Thailand / Bueng Kan / Bueng Kan

Bueng Kan, month by month

Bueng Kan has a measured daily mean on 737 days since 1 January 2023. Its worst month was April 2026, at 183 US AQI (100.9 µg/m³), 5th of 2,941 cities on that month's world ranking. Its cleanest was June 2025, at 39 US AQI (7.0 µg/m³).

Every month since 2023

202683 so far253 days measured246th of 2,793 in the world

Jan74#371 Feb85#298 Mar107#158 Apr183#5 May57#556 Jun45#1,039Jul3 daysAug43#1,760 Sep40#1,208 Oct41#1,296

2025too few days for a mean (a year needs 256)213 days measured

Jan5 daysFeb75#405 Mar111#164 Apr94#145 May52#1,004 Jun39#2,020JulnoneAug6 daysSep47#1,085Oct8 daysNov12 daysDec71#522

2024too few days for a mean (a year needs 257)198 days measured

Jan21 daysFeb20 daysMar20 daysApr152#21 May82#85 Jun55#462Jul19 daysAug19 daysSep5 daysOct2 daysNov3 daysDec1 day

2023too few days for a mean (a year needs 256)73 days measured

Jan81#95Feb2 daysMar9 daysApr19 daysMay15 daysJun5 daysJulnoneAugnoneSepnoneOctnoneNovnoneDecnone

Each square is a month's mean PM2.5 in US AQI from Bueng Kan'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 Bueng Kan 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

26 months

Month	Why
Jul 2026	3 of 31 days measured; a month needs 22. The others: 27 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Nov 2025	12 of 30 days measured; a month needs 21. The others: 18 with no readings from the monitor.
Oct 2025	8 of 31 days measured; a month needs 22. The others: 21 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).
Aug 2025	6 of 31 days measured; a month needs 22. The others: 24 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Jul 2025	No day measured. The others: 30 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Jan 2025	5 of 31 days measured; a month needs 22. The others: 26 with readings for part of the day (a day needs 18 hours).
Dec 2024	1 of 31 days measured; a month needs 22. The others: 30 with readings for part of the day (a day needs 18 hours).
Nov 2024	3 of 30 days measured; a month needs 21. The others: 27 with readings for part of the day (a day needs 18 hours).
Oct 2024	2 of 31 days measured; a month needs 22. The others: 29 with readings for part of the day (a day needs 18 hours).
Sep 2024	5 of 30 days measured; a month needs 21. The others: 25 with readings for part of the day (a day needs 18 hours).
Aug 2024	19 of 31 days measured; a month needs 22. The others: 12 with readings for part of the day (a day needs 18 hours).
Jul 2024	19 of 31 days measured; a month needs 22. The others: 12 with readings for part of the day (a day needs 18 hours).
Mar 2024	20 of 31 days measured; a month needs 22. The others: 11 with readings for part of the day (a day needs 18 hours).
Feb 2024	20 of 29 days measured; a month needs 21. The others: 1 with no readings from the monitor, 7 with readings for part of the day (a day needs 18 hours), 1 missing from OpenAQ's archive.
Jan 2024	21 of 31 days measured; a month needs 22. The others: 10 with readings for part of the day (a day needs 18 hours).
Dec 2023	No day measured. The others: 31 with readings for part of the day (a day needs 18 hours).
Nov 2023	No day measured. The others: 30 with readings for part of the day (a day needs 18 hours).
Oct 2023	No day measured. The others: 31 with no readings from the monitor.
Sep 2023	No day measured. The others: 30 with no readings from the monitor.
Aug 2023	No day measured. The others: 31 with no readings from the monitor.
Jul 2023	No day measured. The others: 30 with no readings from the monitor, 1 missing from OpenAQ's archive.
Jun 2023	5 of 30 days measured; a month needs 21. The others: 17 with no readings from the monitor, 8 with readings for part of the day (a day needs 18 hours).
May 2023	15 of 31 days measured; a month needs 22. The others: 3 with no readings from the monitor, 13 with readings for part of the day (a day needs 18 hours).
Apr 2023	19 of 30 days measured; a month needs 21. The others: 9 with readings for part of the day (a day needs 18 hours), 2 missing from OpenAQ's archive.
Mar 2023	9 of 31 days measured; a month needs 22. The others: 3 with readings for part of the day (a day needs 18 hours), 19 missing from OpenAQ's archive.
Feb 2023	2 of 28 days measured; a month needs 20. The others: 1 with readings for part of the day (a day needs 18 hours), 25 missing from OpenAQ's archive.

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

Bueng Kan's worst months

Month	US AQI	Days measured	World rank	Episode
April 2026	183100.9 µg/m³	28 of 30	5thof 2,941	Northern Thailand and Laos, April 2026 Northern Thailand and Laos, March and April 2026
April 2024	15257.3 µg/m³	29 of 30	21stof 2,520	Thailand and Laos, April and May 2024
March 2025	11139.5 µg/m³	23 of 31	164thof 2,862	Thailand and Laos, March 2025
March 2026	10738.1 µg/m³	31 of 31	158thof 2,971	Northern Thailand and Laos, March and April 2026
April 2025	9432.2 µg/m³	23 of 30	145thof 2,951	–
February 2026	8527.4 µg/m³	28 of 28	298thof 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.

Bueng Kan's worst days

Day	US AQI	Episode
27 Mar 2023	291216.0 µg/m³	Northern Thailand and Laos, March and April 2023
17 Apr 2026	286211.0 µg/m³	Northern Thailand and Laos, April 2026
13 Apr 2026	271196.0 µg/m³	Northern Thailand and Laos, April 2026
14 Apr 2026	269194.0 µg/m³	Northern Thailand and Laos, April 2026
15 Apr 2026	261186.0 µg/m³	Northern Thailand and Laos, April 2026
16 Apr 2026	246171.0 µg/m³	Northern Thailand and Laos, April 2026
26 Mar 2023	241166.0 µg/m³	Northern Thailand and Laos, March and April 2023
11 Apr 2026	231156.0 µg/m³	–
25 Mar 2023	219144.0 µg/m³	Northern Thailand and Laos, March and April 2023
5 Apr 2026	219144.0 µg/m³	Northern Thailand and Laos, March and April 2026

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, Bueng Kan, Thailand, 1 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/bueng-kan/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.

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

Updated 2026-10-12 22:07 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).