SmogRank / Thailand / Uthai Thani / Uthai Thani

Uthai Thani, month by month

Uthai Thani has a measured daily mean on 338 days since 26 August 2025. Its worst month was April 2026, at 152 US AQI (56.5 µg/m³), 54th of 2,941 cities on that month's world ranking. Its cleanest was August 2026, at 53 US AQI (10.1 µg/m³).

Every month since 2025

202684 so far250 days measured234th of 2,793 in the world
Jan118#72Feb98#204Mar104#175Apr152#54May69#320Jun55#520Jul3 daysAug53#873Sep54#578Oct59#303
2025too few days for a mean (a year needs 256)88 days measured
JanFebMarAprMayJunJulAug6 daysSep57#438Oct10 daysNov12 daysDec94#283
Each square is a month's mean PM2.5 in US AQI from Uthai Thani'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 Uthai Thani 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

4 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.

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

Uthai Thani's worst months

MonthUS AQIDays measuredWorld rank
April 2026 15256.5 µg/m³30 of 3054thof 2,941
January 2026 11842.5 µg/m³30 of 3172ndof 2,617
March 2026 10436.6 µg/m³31 of 31175thof 2,971
February 2026 9834.3 µg/m³25 of 28204thof 2,866
December 2025 9432.1 µg/m³31 of 31283rdof 3,006
May 2026 6918.5 µg/m³31 of 31320thof 2,874

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.

Uthai Thani's worst days

DayUS AQI
8 Apr 2026 16372.2 µg/m³
6 Apr 2026 16170.3 µg/m³
9 Apr 2026 16068.2 µg/m³
7 Apr 2026 15967.3 µg/m³
18 Apr 2026 15967.2 µg/m³
19 Apr 2026 15967.0 µg/m³
17 Apr 2026 15966.8 µg/m³
2 Apr 2026 15864.9 µg/m³
16 Jan 2026 15864.8 µg/m³
5 Apr 2026 15864.8 µg/m³

Daily means, the highest since 26 Aug 2025; 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, Uthai Thani, Thailand, 26 Aug 2025 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/uthai-thani/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.

Uthai Thani 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).