S/N

Pollutants

Averaging Period

Maximum Concentration (µg/m3)

NAAQS

World Bank

WHO

1

CO

24-Hr

11,400

-

-

2

NOx

24-Hr

75

150

-

3

SO2

24-Hr

26

-

20

4

PM

24-Hr

250

80

50

5

VOC

24-Hr

6000

-

-