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Air Quality Standards

Ambient Air Standards of Thailand (1995)
Pollutants 1- hr average 8 - hr average 24 - hr average 1- month average 1 - year average** Methods
mg/m3 ppm mg/m3 ppm mg/m3 ppm mg/m3 ppm mg/m3 ppm
1. Carbonmonoxide (CO) 34.2 30 10.26 9 - - - - - - Non - Dispersive Infrared Detection
2. Nitrogen Dioxide (NO2) 0.32 0.17 - - - - - - - - Chemiluminescence
3. Sulfur Dioxide/a (SO2) 0.78 0.30 - - 0.30 0.12 - - 0.10 0.04 UV - Fluorescence
4. Total Suspended Solid (TSP) - - - - 0.33 - - - 0.10 - Gravimetric - High Volume
5. Particulate Matter (< 10 µ)(PM - 10) - - - - 0.12 - - - 0.05 - Gravimetric - High Volume
6. Ozone (O 3) 0.20 0.10 - - - - - - - - Chemiluminescence
7. Lead (Pb) - - - - - - 1.5 - - - Atomic Absorbtion Spectrometer

Remark : * At 1 standard pressure and 25 O C
** geometric mean
/a  1- hr SO2 Standard
  • 1.3 milligram/cubic meter for Mae Moh area
  • 0.78 milligram/cubic meter, elsewhere
Source Notification of National Environmental Board No. 10 (1992) under the Enhancement and Conservation of National Environmental Quality Act B.E.2535 (1992) published in the Royal Government Gazette No. 112 Part 52 dated May 25, B.E.2538(1995)



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