NEW DELHI (Reuters) - India may halt the use of private vehicles in the capital New Delhi if air pollution, which has reached severe levels in recent days, gets worse, a senior environmental official said on Tuesday.

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Toxic smog has started to envelope vast swathes of northern India, including New Delhi, as it does each year when winter approaches and farmers burn off the residue of crops.

“Let us hope the air pollution situation in Delhi doesn’t deteriorate but if it turns out to be an emergency, we will have to stop the use of private transport,” said Bhure Lal, chairman of the Environment Pollution Control Authority (EPCA). “There is a committee which will advise me on this.

EPCA, appointed by India’s Supreme Court, has already proposed halting construction, the use of diesel-run power generators, brick kilns and the burning of garbage between Nov. 1 and Nov. 10 when pollution levels are expected to rise.

Data from the Central Pollution Control Board showed the air quality index, which measures the concentration of poisonous particulate matter, hit 469 in parts of Delhi on Tuesday, up from 299.4 a week ago.

Crop stubble burning, a major source of pollution, vehicular exhaust and a drop-off in wind speeds have aggravated the smog that is likely to worsen around Nov. 7, when fireworks will set off to celebrate the major Hindu festival of Diwali.

As a blanket of haze settled over the area, the provincial leaders of New Delhi and a federal government minister sparred over what to do.

“Every year Delhi suffers because of the ineptness of the federal government and the state governments of neighboring Punjab and Haryana states,” Delhi Chief Minister Arvind Kejriwal said in a tweet.

Farmers in Punjab and Haryana states, India’s bread basket, start burning the residue of the previous crop to prepare for new plantings in November.

Defending the federal government, Environment Minister Harsh Vardhan said his ministry and the state governments of Punjab and Haryana have tried to reduce stubble burning and the Delhi government must intensify its own efforts to help curb pollution.