Millions affected by smoke from wildfires as schools close, respiratory illnesses soar and diplomatic tensions rise

Singapore is threatening to prosecute companies responsible for some of the worst fires in years in neighbouring Indonesia, as the region grows increasingly frustrated with a persistent, acrid haze that could result in diplomatic relations fraying.

Lawrence Wong, the Singaporean prime minister, said his government was distributing masks to vulnerable citizens and working with countries in the region to deal with the smoke. “At the same time, we are looking into which companies may be responsible for the fires,” he said in a Facebook post on Thursday, adding that he was exploring the idea of “joint action with other countries”.

Having tried cloud seeding and water bombing, one pilot project will see dry ice dispersed by plane across the province of South Sumatra

As fires ravage Indonesia, emitting a toxic smoke that has drawn the ire of regional neighbours, the government is testing an unusual new approach to tackle the haze: dry ice.

Having tried cloud seeding, water bombing and sending in army personnel to fight the fires, Indonesia’s coordinating security minister said dry ice would be dropped on the province of South Sumatra on Thursday.