SmogRank / Thailand / Roi Et

Air quality in Roi Et

Roi Et, Thailand. PM2.5 from 1 reference monitor, updated hourly.

40India AQI
Good

Latest hour (05:00 UTC), 1.6× the WHO 24-hour guideline. PM2.5 24.4 µg/m³.

Rank, worst first

24 hours–not enough data
7 days#914of 2,603, at 15 India AQI (9.3 µg/m³)
30 days#651of 2,623, at 18 India AQI (10.5 µg/m³)
This year#448of 2,447, at 37 India AQI (21.9 µg/m³)

Why it ranks here

Cleaner than usual this week. The last 7 days averaged 9.3 µg/m³, well below its typical 17.1; rain or wind often clears the air for a while.
Seasonal. Over the past year its worst months were April, averaging up to 41.5 µg/m³ against 5.8 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

Based on Roi Et's own measurements; causes are the usual kinds for a pattern like this, not a confirmed source.

The last 12 months, day by day

1102031Nov 2025DecJan 2026FebMarAprMayJunJulAugSepOct2025-11-01: no data2025-11-02: no data2025-11-03: no data2025-11-04: no data2025-11-05: no data2025-11-06: no data2025-11-07: no data2025-11-08: no data2025-11-09: no data2025-11-10: no data2025-11-11: no data2025-11-12: no data2025-11-13: no data2025-11-14: no data2025-11-15: no data2025-11-16: no data2025-11-17: no data2025-11-18: no data2025-11-19: 12.6 µg/m³2025-11-20: 8.4 µg/m³2025-11-21: 16.8 µg/m³2025-11-22: 19.6 µg/m³2025-11-23: 21.7 µg/m³2025-11-24: 21.5 µg/m³2025-11-25: 29.6 µg/m³2025-11-26: 32.0 µg/m³2025-11-27: 30.6 µg/m³2025-11-28: 28.6 µg/m³2025-11-29: 40.8 µg/m³2025-11-30: 43.0 µg/m³2025-12-01: 43.0 µg/m³2025-12-02: 28.7 µg/m³2025-12-03: 28.9 µg/m³2025-12-04: 15.8 µg/m³2025-12-05: 13.4 µg/m³2025-12-06: 10.4 µg/m³2025-12-07: 15.9 µg/m³2025-12-08: 20.3 µg/m³2025-12-09: 38.7 µg/m³2025-12-10: 28.4 µg/m³2025-12-11: 25.9 µg/m³2025-12-12: 12.0 µg/m³2025-12-13: 15.1 µg/m³2025-12-14: 11.2 µg/m³2025-12-15: 8.2 µg/m³2025-12-16: 12.0 µg/m³2025-12-17: 11.0 µg/m³2025-12-18: 11.8 µg/m³2025-12-19: 26.2 µg/m³2025-12-20: 34.4 µg/m³2025-12-21: 24.5 µg/m³2025-12-22: 14.7 µg/m³2025-12-23: 18.2 µg/m³2025-12-24: 17.1 µg/m³2025-12-25: 26.4 µg/m³2025-12-26: 10.2 µg/m³2025-12-27: 14.8 µg/m³2025-12-28: 18.3 µg/m³2025-12-29: 22.3 µg/m³2025-12-30: 33.1 µg/m³2025-12-31: 31.8 µg/m³2026-01-01: 35.0 µg/m³2026-01-02: 19.7 µg/m³2026-01-03: 15.2 µg/m³2026-01-04: 14.4 µg/m³2026-01-05: 19.8 µg/m³2026-01-06: 16.2 µg/m³2026-01-07: 14.0 µg/m³2026-01-08: 21.3 µg/m³2026-01-09: 29.2 µg/m³2026-01-10: 31.7 µg/m³2026-01-11: 27.5 µg/m³2026-01-12: 36.5 µg/m³2026-01-13: 48.3 µg/m³2026-01-14: 44.4 µg/m³2026-01-15: 54.3 µg/m³2026-01-16: 52.1 µg/m³2026-01-17: 57.3 µg/m³2026-01-18: 52.4 µg/m³2026-01-19: 51.2 µg/m³2026-01-20: 48.9 µg/m³2026-01-21: 34.7 µg/m³2026-01-22: 19.3 µg/m³2026-01-23: 12.4 µg/m³2026-01-24: 13.1 µg/m³2026-01-25: 28.7 µg/m³2026-01-26: 38.9 µg/m³2026-01-27: 25.1 µg/m³2026-01-28: 21.1 µg/m³2026-01-29: 25.1 µg/m³2026-01-30: 46.6 µg/m³2026-01-31: 38.6 µg/m³2026-02-01: 22.4 µg/m³2026-02-02: 16.8 µg/m³2026-02-03: 10.1 µg/m³2026-02-04: 16.8 µg/m³2026-02-05: 27.6 µg/m³2026-02-06: 35.3 µg/m³2026-02-07: 39.1 µg/m³2026-02-08: 25.1 µg/m³2026-02-09: 14.3 µg/m³2026-02-10: 17.4 µg/m³2026-02-11: 22.6 µg/m³2026-02-12: 21.4 µg/m³2026-02-13: 34.9 µg/m³2026-02-14: 32.4 µg/m³2026-02-15: 31.4 µg/m³2026-02-16: 41.5 µg/m³2026-02-17: 28.9 µg/m³2026-02-18: 12.5 µg/m³2026-02-19: 10.7 µg/m³2026-02-20: 11.7 µg/m³2026-02-21: 13.6 µg/m³2026-02-22: 32.0 µg/m³2026-02-23: 43.8 µg/m³2026-02-24: 46.9 µg/m³2026-02-25: 26.7 µg/m³2026-02-26: 29.0 µg/m³2026-02-27: 27.6 µg/m³2026-02-28: 25.4 µg/m³2026-03-01: 20.8 µg/m³2026-03-02: 26.2 µg/m³2026-03-03: 38.7 µg/m³2026-03-04: 34.0 µg/m³2026-03-05: 18.1 µg/m³2026-03-06: 13.3 µg/m³2026-03-07: 10.7 µg/m³2026-03-08: 19.0 µg/m³2026-03-09: 23.6 µg/m³2026-03-10: 12.1 µg/m³2026-03-11: 12.7 µg/m³2026-03-12: 14.8 µg/m³2026-03-13: 15.6 µg/m³2026-03-14: 16.0 µg/m³2026-03-15: 15.6 µg/m³2026-03-16: 18.9 µg/m³2026-03-17: 25.4 µg/m³2026-03-18: 37.0 µg/m³2026-03-19: 40.2 µg/m³2026-03-20: 34.7 µg/m³2026-03-21: 33.5 µg/m³2026-03-22: 44.0 µg/m³2026-03-23: 49.0 µg/m³2026-03-24: 47.5 µg/m³2026-03-25: 43.3 µg/m³2026-03-26: 55.5 µg/m³2026-03-27: 58.0 µg/m³2026-03-28: 52.1 µg/m³2026-03-29: 52.0 µg/m³2026-03-30: 44.5 µg/m³2026-03-31: 36.3 µg/m³2026-04-01: 43.9 µg/m³2026-04-02: 52.9 µg/m³2026-04-03: 51.2 µg/m³2026-04-04: 53.4 µg/m³2026-04-05: 59.4 µg/m³2026-04-06: 46.6 µg/m³2026-04-07: 48.8 µg/m³2026-04-08: 57.4 µg/m³2026-04-09: 48.1 µg/m³2026-04-10: 43.3 µg/m³2026-04-11: 56.7 µg/m³2026-04-12: 62.9 µg/m³2026-04-13: 48.9 µg/m³2026-04-14: 43.7 µg/m³2026-04-15: no data2026-04-16: 42.5 µg/m³2026-04-17: 41.9 µg/m³2026-04-18: 34.9 µg/m³2026-04-19: 41.8 µg/m³2026-04-20: 30.9 µg/m³2026-04-21: 32.9 µg/m³2026-04-22: 38.7 µg/m³2026-04-23: 38.0 µg/m³2026-04-24: 28.5 µg/m³2026-04-25: 20.3 µg/m³2026-04-26: 27.8 µg/m³2026-04-27: 30.2 µg/m³2026-04-28: 26.2 µg/m³2026-04-29: 21.6 µg/m³2026-04-30: 28.7 µg/m³2026-05-01: 18.4 µg/m³2026-05-02: 20.5 µg/m³2026-05-03: 31.7 µg/m³2026-05-04: 20.1 µg/m³2026-05-05: 20.8 µg/m³2026-05-06: 29.9 µg/m³2026-05-07: 81.6 µg/m³2026-05-08: 36.3 µg/m³2026-05-09: 21.0 µg/m³2026-05-10: 30.5 µg/m³2026-05-11: 27.9 µg/m³2026-05-12: 35.8 µg/m³2026-05-13: 21.2 µg/m³2026-05-14: 17.2 µg/m³2026-05-15: 12.0 µg/m³2026-05-16: 11.7 µg/m³2026-05-17: 12.4 µg/m³2026-05-18: 13.1 µg/m³2026-05-19: 9.4 µg/m³2026-05-20: 7.5 µg/m³2026-05-21: 10.5 µg/m³2026-05-22: 18.8 µg/m³2026-05-23: 17.3 µg/m³2026-05-24: 17.2 µg/m³2026-05-25: 18.6 µg/m³2026-05-26: 9.3 µg/m³2026-05-27: 11.5 µg/m³2026-05-28: 20.0 µg/m³2026-05-29: 14.7 µg/m³2026-05-30: 14.7 µg/m³2026-05-31: 21.7 µg/m³2026-06-01: 16.7 µg/m³2026-06-02: 16.2 µg/m³2026-06-03: 13.0 µg/m³2026-06-04: 11.1 µg/m³2026-06-05: 8.5 µg/m³2026-06-06: 8.7 µg/m³2026-06-07: 8.6 µg/m³2026-06-08: 7.8 µg/m³2026-06-09: 9.9 µg/m³2026-06-10: 10.4 µg/m³2026-06-11: 6.8 µg/m³2026-06-12: 5.8 µg/m³2026-06-13: no data2026-06-14: 11.0 µg/m³2026-06-15: 7.3 µg/m³2026-06-16: 8.9 µg/m³2026-06-17: 8.3 µg/m³2026-06-18: 7.4 µg/m³2026-06-19: 8.1 µg/m³2026-06-20: 12.2 µg/m³2026-06-21: 9.3 µg/m³2026-06-22: 10.4 µg/m³2026-06-23: 14.1 µg/m³2026-06-24: 16.4 µg/m³2026-06-25: 9.4 µg/m³2026-06-26: 7.0 µg/m³2026-06-27: 7.9 µg/m³2026-06-28: 9.3 µg/m³2026-06-29: 7.3 µg/m³2026-06-30: 8.5 µg/m³2026-07-01: 8.2 µg/m³2026-07-02: no data2026-07-03: no data2026-07-04: no data2026-07-05: no data2026-07-06: no data2026-07-07: no data2026-07-08: no data2026-07-09: no data2026-07-10: no data2026-07-11: no data2026-07-12: no data2026-07-13: no data2026-07-14: no data2026-07-15: no data2026-07-16: no data2026-07-17: no data2026-07-18: no data2026-07-19: no data2026-07-20: no data2026-07-21: no data2026-07-22: no data2026-07-23: no data2026-07-24: no data2026-07-25: no data2026-07-26: no data2026-07-27: no data2026-07-28: no data2026-07-29: no data2026-07-30: 11.5 µg/m³2026-07-31: 6.6 µg/m³2026-08-01: 4.6 µg/m³2026-08-02: 4.6 µg/m³2026-08-03: 5.1 µg/m³2026-08-04: 4.4 µg/m³2026-08-05: 6.1 µg/m³2026-08-06: 4.1 µg/m³2026-08-07: 2.9 µg/m³2026-08-08: 4.3 µg/m³2026-08-09: 4.4 µg/m³2026-08-10: 5.0 µg/m³2026-08-11: 5.0 µg/m³2026-08-12: 6.7 µg/m³2026-08-13: 7.8 µg/m³2026-08-14: 7.1 µg/m³2026-08-15: 7.3 µg/m³2026-08-16: 7.8 µg/m³2026-08-17: 7.7 µg/m³2026-08-18: 6.2 µg/m³2026-08-19: 6.1 µg/m³2026-08-20: 4.4 µg/m³2026-08-21: 3.7 µg/m³2026-08-22: 4.6 µg/m³2026-08-23: 4.3 µg/m³2026-08-24: 5.7 µg/m³2026-08-25: 7.9 µg/m³2026-08-26: 7.4 µg/m³2026-08-27: 5.1 µg/m³2026-08-28: 5.3 µg/m³2026-08-29: 6.0 µg/m³2026-08-30: 7.6 µg/m³2026-08-31: 11.8 µg/m³2026-09-01: 8.1 µg/m³2026-09-02: 14.1 µg/m³2026-09-03: 12.4 µg/m³2026-09-04: 15.4 µg/m³2026-09-05: 11.1 µg/m³2026-09-06: 10.3 µg/m³2026-09-07: 10.8 µg/m³2026-09-08: 8.7 µg/m³2026-09-09: 8.8 µg/m³2026-09-10: 8.2 µg/m³2026-09-11: 12.1 µg/m³2026-09-12: 17.7 µg/m³2026-09-13: 22.2 µg/m³2026-09-14: 13.4 µg/m³2026-09-15: 8.1 µg/m³2026-09-16: 8.0 µg/m³2026-09-17: 9.1 µg/m³2026-09-18: 7.3 µg/m³2026-09-19: 8.3 µg/m³2026-09-20: 6.9 µg/m³2026-09-21: 5.7 µg/m³2026-09-22: 9.9 µg/m³2026-09-23: 13.4 µg/m³2026-09-24: 7.8 µg/m³2026-09-25: 4.8 µg/m³2026-09-26: 5.1 µg/m³2026-09-27: 5.7 µg/m³2026-09-28: 6.0 µg/m³2026-09-29: 9.8 µg/m³2026-09-30: 15.4 µg/m³2026-10-01: 18.0 µg/m³
162 of 296 measured days were over the WHO 24-hour guideline (15 µg/m³). One row per month, one square per local day.
Good0–50
Satisfactory51–100
Moderate101–200
Poor201–300
Very poor301–400
Severe401+

India's National Air Quality Index (CPCB), PM2.5 sub-index. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Last 4 days, hour by hour

15302026-10-02 00:00 UTC: 23.4 µg/m³2026-10-02 01:00 UTC: 24.1 µg/m³2026-10-02 02:00 UTC: 24.2 µg/m³2026-10-02 03:00 UTC: 24.2 µg/m³2026-10-02 04:00 UTC: 24.3 µg/m³2026-10-02 05:00 UTC: 24.4 µg/m³Sep 29Sep 30Oct 1Oct 2
Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Where it stood each day

Top 10Top 100#1#10#100#1,000#2,835NovDecJanFebMarAprMayJunJulAugSep#266
Its rank on each day's world board, #1 being the most polluted city that day. The scale is logarithmic: each step down is ten times as many cities. See it among every city.

2026 against 2025, month by month

15Jan 2026: 32.0 µg/m³JanFeb 2025: 24.9 µg/m³Feb 2026: 25.6 µg/m³FebMar 2025: 41.2 µg/m³Mar 2026: 31.1 µg/m³MarApr 2025: 38.6 µg/m³Apr 2026: 41.5 µg/m³AprMay 2025: 16.2 µg/m³May 2026: 21.1 µg/m³MayJun 2025: 20.1 µg/m³Jun 2026: 9.9 µg/m³JunJulAug 2026: 5.8 µg/m³AugSep 2025: 6.7 µg/m³Sep 2026: 10.2 µg/m³SepOct 2025: 8.7 µg/m³OctNov 2025: 25.4 µg/m³NovDec 2025: 20.7 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 9.3 µg/m³9.320252025: 5.8 µg/m³5.8
Mean PM2.5 for 25 Sept to 1 Oct in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
Bueng PlanchaiPermission requested (Thailand PCD, Air4Thai, 2026-10-01)Air4ThaiReference

The city's value is the median of its reference monitors each hour, when at least a third of them report (three are always enough); low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Use this page

SmogRank, PM2.5 daily means, Roi Et, Thailand, 2 Oct 2025 – 1 Oct 2026, smogrank.com/th/roi-et (accessed 2 Oct 2026).

Download chart (PNG)Embed a live widget

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

Other cities in Thailand

30-day averages, India AQI. All of Thailand.

Updated 2026-10-02 06:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the India AQI PM2.5 sub-index.