The 2026 Indonesian wildfires and haze refer to fires in parts of Indonesia that sent smoke across cities and affected air quality in neighbouring countries. The season has been described as Indonesia’s worst fire season since 2015.

Fires in Sumatra and Kalimantan, including peatland fires, caused hazardous air pollution in areas such as Palangka Raya and Katingan district. Peat fires can smoulder underground and produce thick smoke. More than 270,000 cases of respiratory illness were reported in seven Indonesian provinces.

The haze also affected air quality in Singapore, East Timor and Malaysia, where some schools closed. Commercial land clearing by burning has been blamed for many fires. Hotter and drier conditions associated with El Niño were also cited as contributing to increased fire emissions and smoke pollution.