SmogRank / Thailand / Kalasin / Kalasin

Kalasin, month by month

Kalasin has a measured daily mean on 735 days since 1 January 2023. Its worst month was April 2024, at 157 US AQI (64.4 µg/m³), 14th of 2,520 cities on that month's world ranking. Its cleanest was September 2026, at 53 US AQI (10.2 µg/m³).

Every month since 2023

202680 so far252 days measured269th of 2,793 in the world
Jan111#87Feb94#229Mar93#228Apr118#105May72#269Jun58#419Jul3 daysAug55#667Sep53#636Oct64#216
2025too few days for a mean (a year needs 256)218 days measured
Jan5 daysFeb100#147Mar127#113Apr114#86May73#244Jun64#373JulnoneAug6 daysSep61#361Oct10 daysNov12 daysDec90#314
2024too few days for a mean (a year needs 257)198 days measured
Jan86#131Feb137#26Mar18 daysApr157#14May90#67Jun65#152Jul18 daysAug18 daysSep5 daysOct2 daysNov3 daysDec1 day
2023too few days for a mean (a year needs 256)67 days measured
Jan72#145Feb2 daysMar9 daysApr18 daysMay9 daysJun6 daysJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Kalasin'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 Kalasin 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 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 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 202418 of 31 days measured; a month needs 22. The others: 13 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 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2023No day measured. The others: 1 missing from OpenAQ's archive, 30 with under 18 hours of readings or readings that failed our checks.
Jun 20236 of 30 days measured; a month needs 21. The others: 24 with under 18 hours of readings or readings that failed our checks.
May 20239 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Apr 202318 of 30 days measured; a month needs 21. The others: 2 missing from OpenAQ's archive, 10 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.

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

Kalasin's worst months

MonthUS AQIDays measuredWorld rankEpisode
April 2024 15764.4 µg/m³28 of 3014thof 2,520Thailand and Laos, April and May 2024
February 2024 13750.1 µg/m³23 of 2926thof 2,486Northern Thailand and Laos, February 2024
Northern Thailand, February 2024
March 2025 12745.9 µg/m³28 of 31113thof 2,862–
April 2026 11842.6 µg/m³30 of 30105thof 2,941–
April 2025 11440.7 µg/m³23 of 3086thof 2,951–
January 2026 11139.6 µg/m³31 of 3187thof 2,617–

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.

Kalasin's worst days

DayUS AQIEpisode
25 Mar 2025 17386.7 µg/m³–
26 Mar 2025 17285.0 µg/m³–
5 Apr 2024 16981.2 µg/m³–
6 Apr 2024 16880.3 µg/m³–
13 Apr 2024 16880.3 µg/m³–
25 Jan 2025 16778.9 µg/m³Northern Thailand, January 2025
12 Apr 2024 16778.7 µg/m³–
22 Apr 2024 16778.6 µg/m³–
24 Mar 2025 16778.1 µg/m³–
26 Jan 2025 16677.0 µg/m³Northern Thailand, January 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, Kalasin, Thailand, 1 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/kalasin/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.

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

Updated 2026-10-12 23:07 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).