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Visibility also dropped in some parts of the city as a gray haze enveloped streets, high-rises and historical monuments.

“I have never seen anything like this before. We can’t see anything here because of pollution," said Vedant Pachkande, a tourist visiting New Delhi.

India’s top court last week eased a blanket ban on firecrackers in New Delhi during Diwali, allowing limited use of that emit fewer pollutants. Developed by federal research institutes, they are designed to cut particulate and gas emissions by about 30%. The court had said they could be used during specific hours from Saturday to Tuesday, but like past years the rule was mostly flouted.

New Delhi and its metropolitan region — home to more than 30 million people — routinely ranks among the world’s most polluted cities during the winter when widespread Diwali fireworks coincide with cooler weather and smoke from crop residue fires set by farmers in nearby states.

Authorities in New Delhi have implemented a set of measures to curb pollution, which include limits on construction activity and restrictions on diesel generators. But environmentalists say long-term solutions, such as cleaner energy and stricter vehicle-emission controls, are needed to prevent the annual crisis.

Rising pollution also cuts the amount of sunshine India receives, a recent study found.

Indian scientists have found that sunshine hours — the time strong sunlight reaches the Earth — have steadily declined across most of India due to rising air pollution, according to a study published this month in Scientific Reports, a journal by Nature Portfolio. The researchers attributed the drop to increasing aerosols — tiny particles from industrial emissions, biomass burning and vehicle pollution.

“We see a greater impact in more polluted regions such as northern India,� said Manoj K. Srivastava, a scientist at Banaras Hindu University and one of the study’s authors.

Srivastava said the reduction in sunshine can affect the amount of solar power India can generate as well as the country’s agricultural productivity apart from impacting local environment and people’s health.

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AP reporter Sibi Arasu contributed to this report.