By using the infinite line source formula, the NO_x concentration around the ASRC has been calculated when the wind blows from the west, southwest and south. Briggs diffusion parameters(urban) are used and the line source intensily is calculated by using the EPA’s formula.It is shown that when the wind direction is west, the NO_x concentration around the ASRC is heaviest and when the wind shifts from south towest with the atmospheric stability neutral and the wind speed lessthan 2m/sec, the instantaneous NO_x concentration may be 2.8-3.6 times the standard value (rush hours) 5 meters away from the highways and 1.1-1.7 times the standard value (rush hours) 10 meters away from the highways.