The riddle of LPG

Is liquefied petroleum gas (LPG) more environmental friendly than diesel or gasoline?

This is a matter of great concern for the Guangzhou city committee on transport when an investigation report by five local people's congress deputies has concluded with enough evidence that LPG causes more air pollution than diesel.

This southern city has already invested 2.4 billion yuan in replacing 80 percent of the city's buses powered by diesel with LPG-fuelled ones. So the committee has stated that it will continue with its scheme to replace the remaining buses running on diesel with LPG as the latter is on the State list of clean energy, and the LPG scheme has been evaluated by experts and examined by environmental protection department.