In a shocking report, the government research agency CSIR said in a study that the CNG-powered buses emit fine nanocarbon particles which may cause cancer, thus defeating the very purpose of promoting them as environment-friendly transportation system, especially in Delhi.
Before the final report was published, the revelation of primary facts has raised the eye-brows and Delhi-based Centre for Science and Environment came out with a strong rebuttal to disprove CSIR (Council for Scientific and Industrial Research) findings are motivated based on insufficient sample.
The sample was just two Indian buses running on CNG and two diesel buses, one of Canadian make meeting current US Tier II standards (more than Euro VI) fitted with advanced particulate trap, and one Indian diesel bus without diesel particulate trap.
“The CSIR has claimed, without presenting the full study and the facts in the public domain, that CNG buses emit more ultrafine particles than diesel buses and are a health hazard,” said CSE in a statement.
The CSIR study, jointly carried out by CSIR, IIP-Dehradun and University of Alberta, not only tested limited number of buses in Delhi but also misrepresented the facts. The CSIR study, in fact, shows that the CNG (Compressed Natural Gas) run buses are not hazardous to human health, said CSE.
It went ahead to scrutinise the CSIR study in depth to realise that the results were in fact revealing more positive effects of CNG buses with emission levels of nanocarbon particles and other pollutants being very close to EURO VI emission standards. While CSIR findings affirm the benefits of the CNG powered buses, the facts put out for public consumption were entirely different, CSE pointed out.
As many diesel buses in India fail to use clean diesel technology, emission levels from these buses is far more hazardous than CNG-run buses, emitting 600-2000 times more ultrafine particles compared to CNG buses. While the Euro VI emission standard is 600 billion particles / kwhr, CNG buses have recorded just 278 billion particles / kwhr, CSE said.
“This motivated campaign against CNG buses in India, and defiance of what science is saying, will harm not only the CNG bus programme that has given enormous public health benefits but also jeopardise policy decision to leapfrog emissions standards roadmap to Euro VI by 2020 to cut dangerous diesel emissions,” the CSE said in a harsh castigation of what CSIR report said.
Will CSIR respond with full report or corrections made accordingly?