SmogRank / Thailand / Suphan Buri / Suphan Buri

Suphan Buri, month by month

Suphan Buri has a measured daily mean on 758 days since 1 January 2023. Its worst month was April 2026, at 134 US AQI (49.0 µg/m³), 74th of 2,941 cities on that month's world ranking. Its cleanest was September 2025, at 48 US AQI (8.6 µg/m³).

Every month since 2023

202678 so far253 days measured286th of 2,791 in the world
Jan98#129Feb94#222Mar91#256Apr134#74May69#317Jun52#699Jul3 daysAug51#1,098Sep52#714Oct58#321
2025too few days for a mean (a year needs 256)217 days measured
Jan5 daysFeb77#357Mar78#451Apr78#260May54#778Jun52#1,419JulnoneAug6 daysSep48#1,015Oct10 daysNov12 daysDec88#322
2024too few days for a mean (a year needs 257)200 days measured
Jan117#59Feb98#87Mar20 daysApr100#59May71#157Jun57#315Jul18 daysAug18 daysSep4 daysOct2 daysNov3 daysDec1 day
2023too few days for a mean (a year needs 256)88 days measured
Jan96#53Feb1 dayMar9 daysApr19 daysMay15 daysJun10 daysJul5 daysAug3 daysSep3 daysOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Suphan Buri'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 Suphan Buri 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

24 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 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 202418 of 31 days measured; a month needs 22. The others: 13 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 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 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 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.

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

Suphan Buri's worst months

MonthUS AQIDays measuredWorld rankEpisode
April 2026 13449.0 µg/m³30 of 3074thof 2,941–
January 2024 11741.9 µg/m³24 of 3159thof 2,385–
April 2024 10035.2 µg/m³29 of 3059thof 2,520–
January 2026 9834.5 µg/m³29 of 31129thof 2,617–
February 2024 9834.2 µg/m³23 of 2987thof 2,486Thailand, February 2024
January 2023 9633.3 µg/m³23 of 3153rdof 1,261–

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.

Suphan Buri's worst days

DayUS AQIEpisode
17 Apr 2023 16778.0 µg/m³Thailand, April 2023
16 Apr 2023 16777.8 µg/m³Thailand, April 2023
21 Apr 2023 16068.9 µg/m³Thailand, April 2023
2 Apr 2024 16068.9 µg/m³–
22 Apr 2026 15967.0 µg/m³–
15 Feb 2024 15966.8 µg/m³Thailand, February 2024
16 Feb 2024 15662.8 µg/m³Thailand, February 2024
24 Jan 2023 15662.3 µg/m³–
15 Apr 2026 15561.9 µg/m³–
24 Jan 2025 15561.5 µg/m³–

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, Suphan Buri, Thailand, 1 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/suphan-buri/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.

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

Updated 2026-10-12 17:07 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).