The government today informed the Lok Sabha that Environment Pollution (Prevention and Control) Authority (EPCA) has recommended that there is need to ban diesel vehicles in Delhi to prevent emission of high smoke particles.

"The EPCA in a report in 2012 has stated that benefits of CNG transition are not visible due to growth in diesel vehicles, because diesel vehicles are known to emit higher smoke particles and Nitrogen Oxides than petrol cars," environment minister Jayanthi Natarajan said during Question Hour.
Earlier in 2007, the EPCA had expressed this concern in a detailed report filed by it in the Supreme Court titled "Controlling Pollution from the growing number of diesel cars in Delhi".