Auto Exhaust Concentration in a Tunnel

One of the trouble about tunnelis nuisance of auto exhaust gas for foot passenger. On account of few example of field measurement to polluted phenomena in tunnel, the technical countermeasure would not be considered easily. So that, as a means to improve such a state, a distribution of CO concentration was examined. Samples of 93 points in and around the tunnel of 270m length were collected and measured about CO by gas chromatography with reaction tube. The result shows as a distribution graph as follows. It was found that exhaust gas was sent out from tunnel and the complex pollution with high level was formed