Exhaust emissions of an LPG powered vehicle in real operating conditions Jerzy Merkisz, Dawid Gallas, Maciej Siedlecki, Natalia Szymlet and Barbara Sokolnicka E3S Web Conf., 100 (2019) 00053 Published online: 10 June 2019 DOI: 10.1051/e3sconf/201910000053