to urgently improve the fuel quality of vehicles and upgrade their emission
technology if it wants to make the ambient air breathable, experts said. Sumit
Sharma, a fellow with The Energy and Resources Institute (TERI) and an expert
on air pollution, said, "CNG fuel and Metro could have brought particulate
matter (PM) concentrations down but fuel quality for other activities remains
relies on Bharat Stage-IV norms whereas the world has moved to Euro 5 and 6 standards."
According to Sharma, the Auto Fuel Policy 2002 had the mandate of bringing 13
cities under BS-IV norms and the rest under BS-III by 2010. BS-IV is the
equivalent of Euro 4.