SmogRank / Thailand / Sukhothai / Sukhothai

Sukhothai, month by month

Sukhothai has a measured daily mean on 750 days since 1 January 2023. Its worst month was February 2024, at 159 US AQI (66.7 µg/m³), 14th of 2,486 cities on that month's world ranking. Its cleanest was June 2024, at 34 US AQI (6.2 µg/m³).

Every month since 2023

202675 so far244 days measured323rd of 2,791 in the world
Jan76#317Feb71#570Mar83#368Apr158#29May68#323Jun51#772Jul3 daysAug48#1,337Sep46#933Oct54#525
2025too few days for a mean (a year needs 256)219 days measured
Jan5 daysFeb110#110Mar140#78Apr83#215May43#1,407Jun38#2,042JulnoneAug6 daysSep48#1,015Oct10 daysNov12 daysDec119#242
2024too few days for a mean (a year needs 257)202 days measured
Jan144#29Feb159#14Mar20 daysApr148#25May80#98Jun34#1,967Jul18 daysAug19 daysSep5 daysOct2 daysNov3 daysDec1 day
2023too few days for a mean (a year needs 256)85 days measured
Jan20 daysFeb2 daysMar9 daysApr19 daysMay15 daysJun10 daysJul5 daysAug3 daysSep2 daysOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Sukhothai'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 Sukhothai 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 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.
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 20243 of 30 days measured; a month needs 21. The others: 27 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 20245 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks.
Aug 202419 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Jul 202418 of 31 days measured; a month needs 22. The others: 13 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.
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 20232 of 30 days measured; a month needs 21. The others: 28 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 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 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 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.
Jan 202320 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 5 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.

Sukhothai's worst months

MonthUS AQIDays measuredWorld rankEpisode
February 2024 15966.7 µg/m³22 of 2914thof 2,486Thailand, February 2024
Northern Thailand and Laos, February 2024
April 2026 15866.1 µg/m³30 of 3029thof 2,941Northern Thailand and Laos, April 2026
April 2024 14854.5 µg/m³29 of 3025thof 2,520Thailand and Laos, April and May 2024
January 2024 14452.8 µg/m³24 of 3129thof 2,385–
March 2025 14051.3 µg/m³28 of 3178thof 2,862Thailand and Laos, March 2025
December 2025 11942.7 µg/m³26 of 31242ndof 3,006–

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.

Sukhothai's worst days

DayUS AQIEpisode
7 Mar 2024 203128.0 µg/m³Northern Thailand and Laos, March 2024
7 Apr 2023 199124.0 µg/m³Northern Thailand and Laos around Bangkok, 5 to 8 April 2023
6 Mar 2024 199124.0 µg/m³Northern Thailand and Laos, March 2024
18 Apr 2026 195118.0 µg/m³Northern Thailand and Laos, April 2026
19 Apr 2026 192114.0 µg/m³Northern Thailand and Laos, April 2026
17 Feb 2024 186106.0 µg/m³Thailand, February 2024
14 Apr 2026 186105.0 µg/m³Northern Thailand and Laos, April 2026
15 Feb 2023 184103.0 µg/m³North-western Thailand and Laos, February 2023
13 Apr 2026 184102.0 µg/m³Northern Thailand and Laos, April 2026
26 Mar 2025 18299.2 µg/m³Thailand and Laos, March 2025

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

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

Updated 2026-10-12 18:07 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).