SmogRank / Thailand / Trang / Trang

Trang, month by month

Trang has a measured daily mean on 748 days since 1 January 2023. Its worst month was January 2024, at 69 US AQI (19.0 µg/m³), 305th of 2,385 cities on that month's world ranking. Its cleanest was September 2025, at 37 US AQI (6.6 µg/m³).

Every month since 2023

202655 so far248 days measured777th of 2,791 in the world
Jan58#867Feb55#1,114Mar59#1,037Apr63#558May41#1,539Jun40#1,374Jul1 dayAug55#677Sep51#763Oct64#165
2025too few days for a mean (a year needs 256)222 days measured
Jan5 daysFeb58#961Mar61#1,008Apr45#1,736May38#1,671Jun50#1,601JulnoneAug6 daysSep37#1,841Oct10 daysNov12 daysDec52#1,458
2024too few days for a mean (a year needs 257)197 days measured
Jan69#305Feb60#380Mar20 daysApr63#384May59#367Jun54#494Jul19 daysAug17 daysSep5 daysOct1 dayNov3 daysDec1 day
2023too few days for a mean (a year needs 256)81 days measured
Jan18 daysFeb2 daysMar9 daysApr19 daysMay12 daysJun10 daysJul6 daysAug2 daysSep3 daysOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Trang'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 Trang 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 20261 of 31 days measured; a month needs 22. The others: 30 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 20241 of 31 days measured; a month needs 22. The others: 30 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 202417 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Jul 202419 of 31 days measured; a month needs 22. The others: 12 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 20232 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Jul 20236 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 24 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 202312 of 31 days measured; a month needs 22. The others: 19 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 202318 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 7 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.

Trang's worst months

MonthUS AQIDays measuredWorld rank
January 2024 6919.0 µg/m³23 of 31305thof 2,385
April 2024 6315.5 µg/m³29 of 30384thof 2,520
April 2026 6315.4 µg/m³30 of 30558thof 2,941
March 2025 6114.3 µg/m³29 of 311,008thof 2,862
February 2024 6013.8 µg/m³21 of 29380thof 2,486
May 2024 5913.4 µg/m³30 of 31367thof 2,684

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.

Trang's worst days

DayUS AQI
16 Apr 2023 11842.6 µg/m³
9 Oct 2026 9231.3 µg/m³
17 Apr 2023 9130.5 µg/m³
20 Apr 2023 9030.1 µg/m³
12 Apr 2023 8929.5 µg/m³
24 Aug 2026 8728.2 µg/m³
21 Apr 2023 8426.7 µg/m³
26 Mar 2025 8326.2 µg/m³
6 Jan 2024 8225.6 µg/m³
29 Aug 2026 8225.6 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, Trang, Thailand, 1 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/trang/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.

Trang 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).