The emission source of automobile exhaust pollutants is calculated as follows:
\(Q=∑^n_{i=1} NiEi/3600000\)
In the formula:
Q-contaminant emission source intensity, g/m•s;
N-the total number of road vehicles;
Ni-i type car traffic, vehicle / h;
The Ei-i type vehicle exhaust comprehensive emission factor, g/km, is regarded as the speed of the medium-sized vehicle. The recommended value of the medium-sized vehicle emission factor is 50km/h. HC3.29g/km., CO42.27g/km., NOX4.18g/km.
Vehicle exhaust gas coefficient for different road types
| Road type | Average speed | CH4（Kg/set one kilometer） | CO（Kg/set one kilometer） |
| Big road | 16 | 0.006 | 0.099 |
| road | 29 | 0.004 | 0.059 |
| highway | 39 | 0.004 |
0.048 |
| highway | 72 | 0.002 | 0.028 |
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