This paper titled "Evaluation of noise pollution by motor vehicle noise on main roads in the district of Nueva Cajamarca province of Rioja, San Martin region" was aimed at determining the degree of noise pollution on main roads access in the district of Nueva Cajamarca For the development ofthis research is initiated by selecting the most critical points in the city ofNueva Cajamarca, of which a total of 40 points was chosen, then had to monitor 40 critica! points for a period of six months to achieve more reliable data using devices acoustic measurement (sound level meter), these results were calculated, averaged and arranged in cabinet to get the sound pressure level equivalent a-weighted (LAeqT) then be compared with those established in the rules of national environmental quality standards for noise (supreme Decree No. 085-2003-PCM). Shooting was performed and the UTM coordinates of ...