Permissible exhaust emissions limits for commercial vehicles tend to be highly changeable. Since the introduction of exhaust-gas standards in 1992, the limits for nitrogen oxides have been reduced by 97% and by over 98% for particulates. Nonetheless, the exhaust gas emissions of the MAN Lion's City G lie significantly below the Euro 6 limits. That is why MAN's natural gas buses are an investment which makes economic sense in the long term.