“WITH HAND-CARTS functioning as Pollution Under Control (PUCs) in the city, a report by the Environmental Pollution (Prevention and Control) Authority (EPCA) has found that existing PUC programmes are not adequate to address the transition to Bharat Stage (BS) VI emission standards, likely to be enforced by 2020.”
The Indian Express

Read it on Delhiair.org:
Current norms are not enough to enforce BS-VI standards, says EPCA