Mount Bromo was closed as firefighters worked prevent the blaze spreading in the conservation zone. (AP PHOTO)Mount Bromo was closed as firefighters worked prevent the blaze spreading in the conservation zone. Active hot spots remain in four areas within the park: Watangan, Argowulan, Dingklik-Pakis and Bincil-Mungal. Teams had been working to prevent flare-ups on the ground and with aerial operations, Nugraha said. Peatland fires generate dense smoke that contributes to hazardous haze, worsening air quality and increasing health risks across affected areas, sometimes even in neighbouring countries, he said.