Gurugram/Noida, Dec. 16 -- With a blanket of smog over Delhi and the National Capital Region (NCR), visibility dropped to as low as 10 metres and at least four people were killed and 35 others were injured in several accidents on Monday morning.

At least 18 vehicles were involved in a pile-up on the Delhi-Mumbai Expressway in Haryana's Nuh at 7.30 am, killing two people on the spot. According to the National Highways Authority of India (NHAI), the collision began with a passenger bus ramming into a dumper truck as a result of the near-zero visibility. A car then crashed into the bus, with subsequent vehicles ploughing into the wreckage within minutes. "Within 15 minutes, nearly 18 vehicles had collided as visibility was barely 10-15 metr...