HONG KONG — As pollution in Singapore soared to record levels on Thursday, local officials pressed Indonesia to curtail the widespread burning of forests, which they say is causing the stubborn haze enveloping the city-state.

The Pollution Standards Index, a uniform system used by Singapore to measure pollution, hit 371 at 1 p.m., topping the previous record of 226, which was set in 1997. Health officials consider any level above 300 to be hazardous to health.

Residents were urged to remain indoors, while air traffic controllers at Changi Airport were told to take extra precautions in directing flights. In neighboring Malaysia, more than 200 schools were ordered closed because of the pollution.

The persistence of the pollution this week has tested ties with Indonesia, where farmers in Sumatra often burn forests at this time of year as a cheap way to prepare the land for new plantings. Though such burning violates local laws, Indonesian officials have failed to stop it.

“No country or corporation has the right to pollute the air at the expense of Singaporeans’ health and well-being,” Vivian Balakrishnan, Singapore’s environment minister, said in calling for Indonesian action to curb the fires.

Indonesian officials say Malaysia and Singapore deserve part of the blame because their companies control many of the palm oil plantations where the burning takes place.

An Indonesian official struck back on Thursday at the criticism from Singapore. Agung Laksono, the coordinating minister for people’s welfare, said, “Singapore shouldn’t be like children, in such a tizzy,” according to The Straits Times of Singapore.

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