Experts refute report on LPG emissions

Experts with China's environment, science and technology authorities are refuting a local report that calls into question the environmental friendliness of LPG-powered buses. The report, released by the Guangzhou Municipal People's Congress, concludes that hydrocarbon emissions by LPG buses are 127 times higher than those produced by diesel buses. However, leading environmental experts are disputing that result, saying it is not based on reliable science.

Experts with the Ministry of Science and Technology say LPG has been recognized as a clean energy source worldwide. Its emissions have also proved to be much lower than those of gasoline and diesel.

In arriving at its conclusion, the Guangzhou report cites the example of an LPG-powered bus that consumes up to 110 liters of fuel per 100 kilometers. But experts counter by saying that the bus in question is undoubtedly experiencing problems, as an LPG-powered bus normally consumes between 50 and 60 liters of fuel.

Zhang Jinhua, Expert of Energy-Saving & New Energy Auto Project said "Only when two buses are operating under exactly the same conditions can their emissions test results be comparable."

As a result, experts with the Ministry of Environmental Protection say the test is scientifically meaningless.

Tang Dagang, Director of Vehicle Emission Control Center said "The report only cites one example to base such a conclusion on. It is not solid science. I do not think we should discuss the issue further."

University experts echo the view. They say it is economically feasible to keep LPG-powered buses running in Guangzhou, as LPG is easier to access than natural gas. They add that the LPG project has been operating successfully for six years already, and suggest the city be prudent when choosing an alternative technology.