Air Quality and Noise Standard
 
 
  | Ambient Air Standards | Sulfur Dioxide Standards | Volatile Organic Compounds Standards |

Ambient Air Standards
PollutantsaverageStandard
1. Carbonmonoxide (CO)1 hr Not exceed 30 ppm. (34.2 mg/m3)
8 hr Not exceed 9 ppm. (10.26 mg/m3)
2. Nitrogen Dioxide (NO2) 1 hr Not exceed 0.17 ppm. (0.32 mg/m3)
3. Ozone (O3) 1 hr Not Exceed 0.10 ppm. (0.20 mg/m3)
8 hr Not Exceed 0.07 ppm. (0.14 mg/m3)
4. Sulfur Dioxidea (SO2)1 yearNot exceed 0.04 ppm. (0.10 mg/m3)
24 hr Not exceed 0.12 ppm.(0.30 mg/m3)
1 hr Not exceed 0.3 ppm.(780 µg/m3)
5. Lead (Pb)1 monthNot exceed 1.5 µg/m3
6. Particulate Matter (< 10 µ)(PM - 10)24 hr Not exceed 0.12 mg/m3
1 yearNot exceed 0.05 mg/m3
7. Particulate Matter (< 100 µ)24 hr Not exceed 0.33 mg/m3
1 yearNot exceed 0.10 mg/m3

Remark:1.

Short term average standandard (1, 8 and 24 hrs.)is to prevent acute effect on for human health

2. Long term average standard (1 month and 1 year ) is to prevent long term or chronic effect on human health
a1- hr SO2 Standard
  • 1.3 milligram/cubic meter for Mae Moh area
  • 0.78 milligram/cubic meter, for elsewhere
    • Source:
    1. Notification of National Environmental Board No. 10 , B.E 2538 (1995) 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)
    2. Notification of National Environmental Board No. 24, B.E. 2547 (2004) under the Enhancement and Conservation of National Environmental Quality Act B.E.2535 (1992), published in the Royal Government Gazette No. 121 Special Part 104 D dated September 22, B.E.2547 (2004)
    3. Notification of National Environmental Board No. 28 , B.E 2550 (2007) under the Enhancement and Conservation of National Environmental Quality Act B.E.2535 (1992), published in the Royal Government Gazette No. 124 Part 58 dated May 14, B.E.2550 (2007)


    Sulfur Dioxide in Ambient Air Standards of Thailand
    Pollutant Concentration/time/area Standard value
    Sulfur Dioxide (SO2) 1 hr./area Not exceed0.30 ppm 
    (780 µg/m3)

    Source : Notification of National Environmental Board No. 12 (1995) under the Enhancement and Conservation of National Environmental Quality Act B.E.2535 (1992) published in the Royal Government Gazette No. 112 Special Part 27 D dated July 13, B.E.2538 (1995) and Notification of National Environmental Board No. 21 (2001) under the Enhancement and Conservation of National Environmental Quality Act B.E.2535 (1992) published in the Royal Government Gazette No. 118 Special Part 39D dated April 30, B.E.2544 (2001)

    Volatile Organic Compounds (VOCs) in Ambient Air Standards of Thailand
    PollutantsStandard
    1. Benzene Not exceed 1.7 µg/m3
    2. Vinyl ChlorideNot exceed 10 µg/m3
    3. 1,2 - Dichloroethane Not exceed 0.4 µg/m3
    4. TrichloroethyleneNot exceed 23 µg/m3
    5. Dichloromethane Not exceed 22 µg/m3
    6. 1,2 - Dichloropropane Not exceed 4 µg/m3
    7. Tetrachloroethylene Not exceed 200 µg/m3
    8. Chloroform Not exceed 0.43 µg/m3
    9. 1,3 - Butadiene Not exceed 0.33 µg/m3

    Remark:1.

    One year Volatile Organic Compounds (VOCs) in Ambient Air is determined from the Arithemetic Mean of VOCs analysis from continuously 24 hour ambient air sampling (at least once a month)

    2. In case of the collected ambient air sample(s) was unable to be analysed, the new sampling and analysis must be done within 30 days from the previous sampling date.
    3. Reference Condition is 25 degree Celsius at 1 atm or 760 mmHg
    Source:
    1. Notification of National Environmental Board No. 30 , B.E 2550 (2007) under the Enhancement and Conservation of National Environmental Quality Act B.E.2535 (1992), published in the Royal Government Gazette No. 124 Part 143 dated September 14, B.E.2550 (2007)