The escalation in tensions between tiny Singapore and its vast neighbour came as the levels of haze enveloping the island hit a new record high, shrouding the whole city, from residential blocks to tree-lined parks.
As the acrid smell of burnt wood crept into people's flats and medical masks sold out at drug stores, the city-state's environment chief demanded "decisive action" to address the crisis after talks with Indonesian officials in Jakarta.
"Singapore should not be behaving like a child and making all this noise," Agung Laksono, the minister coordinating Indonesia's response, told reporters. "This is not what the Indonesian nation wants, it is because of nature."
Singapore's air pollution index hit a new all-time high today, soaring to 371 at 1:00 pm (1030 IST), well past the previous record of 321 set the night before, before falling later in the afternoon.
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Singapore's prime minister declined to respond to Laksono's provocative comments, saying he did not want to engage in "megaphone diplomacy".
Lee urged people to stay indoors and protect themselves from the haze which has hung over the island since Monday, asking citizens to "look out for one another".
"We cannot tell how the haze problem will develop," Lee told a press conference. "It can easily last for several weeks and quite possibly longer until the dry season ends in Sumatra."
"The situation is deteriorating," he said. "We have highlighted to our Indonesian counterparts that it is time now for decisive action."
Drug stores in Singapore's central business district were sold out of disposable masks and refused to take advance orders, as the strong odour seeped into homes across the island as well as inside the air-conditioned trains of the metro system.