Revealing Benzene, Toluene, Ethyl Benzene, Xylenes (BTEX) Emission at Gas Stations, Case Study in Semarang CityHaryono S Huboyo, Irawan W Wardhana and Auliafika ResminingpuriE3S Web Conf., 125 (2019) 10002DOI: https://doi.org/10.1051/e3sconf/201912510002