Explained: As odd-even kicks in, how polluting are Delhi vehicles

Assessments of the role played by vehicles in fouling Delhi's air have varied widely. However, the most recent study, published in 2016, said moving vehicles contributed to over half of Delhi's air pollution.

A volunteer holds a placard with information regarding restrictions on private vehicles in New Delhi on Monday. (Reuters)

As the odd-even road rationing scheme began in Delhi on Monday, the number of vehicles out in the streets were reported to have come down significantly, and Chief Minister Arvind Kejriwal claimed that the order was seeing near 100 per cent compliance.