Welcoming the reduction in pollution, environmentalists urged the government to treat it as a "wake-up call" and stop its "obsession" with "development" at the cost of the environment.
Kejriwal announced the odd-even scheme as part of the seven-point 'Parali Pradushan' action plan that also includes mass distribution of anti-pollution masks, mechanised sweeping and water sprinkling on the roads, tree plantation, and special plans for 12 pollution hotspots in the city.
Rickshaw pullers and construction workers are the worst hit.
In a gross violation of a Supreme Court order, people in several cities burst firecrackers until at least midnight, two hours after the 10 pm deadline. Loud bangs rent the air in New Delhi.