Diesel hides behind CNG - Delhi report by CSE, India

Click on the links below for report by CSE on emissions from Diesel and CNG vehicles in Delhi, India.

1.	What is the rationale for selecting the odd combination of carbonyl and methane to rank fuels? Why has it left out more toxic and important cancer causing compounds that other governments prioritise?
2.	Why only one greenhouse gas which is typically associated with CNG selected to compare fuels?
3.	Why has the study compared old retrofitted CNG and LPG vehicles with OEM vehicles on diesel and petrol?
4.	Why has the study not mentioned the actual composition of the fuels used for testing the vehicles, especially when the study takes note of the fact that changes in the fuel parameters have bearing on the unregulated toxic emissions?
5.	Wrong and contradictory conclusions drawn in the study
6.	What needs to be done?