An Investigating of Carbon Monoxide Pollution in Tunnels of Haraz Road

Carbon monoxide is one of the most important air pollutant gases. It has very serious destructive effects on human health. It use an index gas in the projects of tunnel ventilation planning. For this research, the CO concentration was measured by gas analyzser model Emicont 70 equipment in 5 tunnel of Haraz road in the morning and afternoon of 3 deys. Sampling was done in the 6 minutes at an altitude of 1 meter with the earth surface –respiratory altitude- during the spring. The results show the high concentration of this pollutant gas in investigated tunnels. The concentration of CO was in 9-300 ppm range, that it shows positive correlation with the length of tunnels and real transport.