15 PENGARUH PENGGUNAAN FILTER PADA KNALPOT SEPEDA MOTOR UNTUK MENGURANGI TINGKAT EMISI GAS BUANG KENDARAAN ABSTRACT Vehicles gas emissions are the most dominant factor causing air pollution, especially in large cities. Gas emissions produced by motor vehicles cause air pollution around 70-80 percent. Base on Central Statistics Agency in 2017, the proportion of motorcycle is 86% of the total of vehicles, 12% of passenger cars and 2% of buses. To reduce the increase in pollutant material is to use exhaust gas filters on vehicles. The utilization of installed gas filters in Indonesia is still limited to passenger cars while the proportion of motorcylce highest compared to other vehicles. This research is a laboratory research with quantitative methods, where data analysis is used in this study to find out how much influence the utilization of filters on motorcyle exhaust to reduce the level of motorcycle gas emissions. To find out the value of motorcycle gas emissions, the instrument used is a gas analyzer. The filter material used is zeolite with a thickness variation of 5cm, 10cm and 13cm, this filter is installed on the motorcyle exhaust. The result of the average HC and CO values, filters with a thickness of 10 cm are more effective than filters with a thickness of 5 cm and 13 cm, with an average reduction in CO levels of 33% and HC by 44%. Keywords: Gas Emissions, Motor Cycle, Ziolite Filter Novita Sari, M.Eng Dosen STTD Jl. Raya Setu No. 89, Bekasi Telp./Fax : (021) 8254640 Dani Hardianto, M.Sc Dosen STTD Jl. Raya Setu No. 89, Bekasi Telp./Fax : (021) 8254640 Bobby Agung Hermawan, MT Dosen STTD Jl. Raya Setu No. 89, Bekasi Telp./Fax : (021) 8254640 Dr. Made Suraharta, MT Dosen STTD Jl. Raya Setu No. 89, Bekasi Telp./Fax : (021) 8254640