Mathura: Around 20 cars piled up at the Yamuna Expressway near Mathura as smog continues to engulf the Delhi-NCR region four days after Diwali.

Reportedly, several people have been left injured in the accidents that occurred at the Yamuna Expressway.

Mathura (UP): Several injured after more than 20 vehicles pile-up on Yamuna expressway due to dense fog pic.twitter.com/S5MOOMWWYj — ANI UP (@ANINewsUP) November 3, 2016

Delhiites, on Thursday, woke up to another smoggy morning with air quality-monitoring agencies saying that pollution levels will remain 'severe' for the next couple of days due to adverse climatic conditions.

On Thursday, Anand Vihar, RK Puram, Punjabi Bagh, Mandir Marg recorded the highest pollution levels with PM levels at 999.

Earlier on Tuesday, it was found that the Delhi Pollution Control Board stopped airing 24-hour average.

On the same day, after a nearly 21-fold increase in pollution levels here on Diwali, the Centre had summoned governments of Punjab, Delhi, Haryana, Rajasthan and Uttar Pradesh over enforcing ban on stubble burning.