World

New Delhi, world's most polluted city, briefly makes major road car-free to help clear air

  • Indians participate in a cycle rally during a car-free day covered only a six-kilometer (4-mile) stretch in New Delhi, India, Thursday, Oct. 22, 2015. The world's most polluted capital, New Delhi, closed a major stretch of road to private cars for a few hours, hoping to give its citizens a brief breath of fresh air by observing a car-free day. (AP Photo/Tsering Topgyal)

    Indians participate in a cycle rally during a car-free day covered only a six-kilometer (4-mile) stretch in New Delhi, India, Thursday, Oct. 22, 2015. The world's most polluted capital, New Delhi, closed a major stretch of road to private cars for a few hours, hoping to give its citizens a brief breath of fresh air by observing a car-free day. (AP Photo/Tsering Topgyal)  (The Associated Press)

  • Indian policemen stand and wait for cyclists during a car-free day covered only a six-kilometer (4-mile) stretch in New Delhi, India, Thursday, Oct. 22, 2015. The world's most polluted capital, New Delhi, closed a major stretch of road to private cars for a few hours, hoping to give its citizens a brief breath of fresh air by observing a car-free day. (AP Photo/Tsering Topgyal)

    Indian policemen stand and wait for cyclists during a car-free day covered only a six-kilometer (4-mile) stretch in New Delhi, India, Thursday, Oct. 22, 2015. The world's most polluted capital, New Delhi, closed a major stretch of road to private cars for a few hours, hoping to give its citizens a brief breath of fresh air by observing a car-free day. (AP Photo/Tsering Topgyal)  (The Associated Press)

  • Delhi Chief Minister Arvind Kejriwal, center, takes part in a cycle rally during a car-free day covered only a six-kilometer (4-mile) stretch in New Delhi, India, Thursday, Oct. 22, 2015. The world's most polluted capital, New Delhi, closed a major stretch of road to private cars for a few hours, hoping to give its citizens a brief breath of fresh air by observing a car-free day. (AP Photo/Tsering Topgyal)

    Delhi Chief Minister Arvind Kejriwal, center, takes part in a cycle rally during a car-free day covered only a six-kilometer (4-mile) stretch in New Delhi, India, Thursday, Oct. 22, 2015. The world's most polluted capital, New Delhi, closed a major stretch of road to private cars for a few hours, hoping to give its citizens a brief breath of fresh air by observing a car-free day. (AP Photo/Tsering Topgyal)  (The Associated Press)

The world's most polluted capital, New Delhi, has closed a major stretch of road to private cars for a few hours, hoping to give its citizens a brief breath of fresh air by observing a car-free day.

Only public transport was allowed to ply Thursday on the road from Old Delhi to the doorstep of Parliament.

The city's top elected official, Arvind Kejriwal, led hundreds of cyclists as they pedaled the route to encourage people to use public transport.

Although the event covered only a six-kilometer (4-mile) stretch, many people hailed the Delhi government's effort as a first step to clean the city's heavily polluted air.

Air pollution kills millions of people every year, including more than 627,000 in India, according to the World Health Organization.