CO conc. Traffic density 2,4000 50,0000 1,7000 26,0000 1,4000 16,0000 1,2000 10,0000 1,2000 12,0000 2,0000 41,0000 3,4000 157,0000 5,8000 276,0000 6,8000 282,0000 6,6000 242,0000 6,6000 200,0000 6,3000 186,0000 5,8000 179,0000 5,5000 178,0000 5,9000 203,0000 6,8000 264,0000 7,0000 289,0000 7,4000 308,0000 6,4000 267,0000 5,0000 190,0000 3,8000 125,0000 3,5000 120,0000 3,3000 116,0000 3,1000 87,0000