Specific index corresponding to nitrogen dioxide is determined by fitting the concentration of the average hourly concentrations in one of the fields listed in the following table:
Range for nitrogen dioxide (g / m3) | specific index |
0-40 |
1
|
40-90 |
2
|
90-120 |
3
|
120-230 |
4
|
230-340 |
5
|
340-1000 |
6
|