The odd-even formula of traffic rationing is going to be implemented in Delhi in an effort to tackle the smog that has made it difficult to breath in the national capital.

The Delhi government said it will impose the odd-even car rationing scheme during November 13-17, reported Times of India.

For the past two days, a deadly haze has enveloped Delhi, causing misery to people. The smog has forced the closure of primary schools.

The authorities have now brought back the odd-even formula under which cars with licence plates ending in an odd number and even-number ply on alternate days. Last time, two-wheelers were exempted from the scheme.

When the formula was in place, people had demanded that there should be better public transportation system. People had wanted more buses and more frequent metro services.

The odd-even formula was worked out by the Aam Aadmi Party (AAP) led by Arvind Kejriwal. It’s implementation had led to a significant reduction in traffic on Delhi’s normally jam-packed roads.

The scheme was twice implemented in 2016. Once from January 1-15 and the second time from April 15-30.

“Delhi has become a gas chamber. Every year this happens during this part of year. We have to find a soln to crop burning in adjoining states,” Kejriwal tweeted on Wednesday.

Read: Delhi needs policies to complement odd-even