SmogRank / World / Asia / Thailand / Loei

Most polluted cities in Loei, Thailand

1 measured city, this year; 1 above the WHO annual guideline. Worst: Loei at 26.4 µg/m³, #359 in the world.

Uttaradit: 1 measured cityPhitsanulokPhichit: 1 measured cityPhetchabun: 1 measured cityNong KhaiLoeiKhon Kaen: 1 measured cityChaiyaphum: 1 measured cityUdon Thani: 1 measured cityNong Bua Lamphu: 1 measured cityNan#1 Loei: 26.4 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
  1. 1Loei 385.3×
Excellent0–50
Good51–100
Lightly polluted101–150
Moderately polluted151–200
Heavily polluted201–300
Severely polluted301+

China's Air Quality Index (HJ 633-2012), PM2.5 individual index. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Estimated: cities without a monitor

Loei cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Phu Kradueng≈ 4 µg/m³Excellent
Wang Saphung≈ 4 µg/m³Excellent
Erawan≈ 5 µg/m³Excellent

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SmogRank, most polluted cities in Loei, Thailand, PM2.5, this year to 2 Oct 2026, 04:00 UTC, smogrank.com/th/region/loei?w=year.

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Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the China AQI PM2.5 sub-index.