There are 16.6 million registered vehicles in the city as of 30 June 2014, which is the highest in the world among all cities, most of which do not follow any pollution emission norm (within municipal limits), while the Delhi metropolitan region  (NCR Delhi) has 11.2 million vehicles.
The number of registered vehicles in the city as of June 30, 2014, is 16.6 million, which is the highest globally among all cities; most do not follow pollution emission norms (within municipal limits), whereas the Delhi metropolitan region (NCR Delhi) has 11.2 million vehicles.