Haze Crisis Spreads to Southern Vietnam and Singapore as 23 Peninsular Malaysia Areas Turn Unhealthy

The transboundary haze crisis widened its geographic footprint significantly on Sept. 14. The ASEAN Specialised Meteorological Centre detected moderate-to-dense smoke haze across central/southern Sumatra and West/Central Kalimantan extending, for the first time this season, as far as southern Vietnam. Singapore's central-region PSI crossed back into the unhealthy range at 102 by 8am, rising to 108 by 2pm — its first unhealthy reading in four days after a brief improving stretch since Sept. 4's spike; NEA's advisory forecast the next 24 hours would stay in the moderate-to-low-unhealthy range. Within Malaysia, the number of areas nationwide with unhealthy API readings climbed steadily through the day — 9 at 10am, 22 by 4pm, 23 by 6pm — spreading well beyond Sarawak into Johor (7 areas: Pasir Gudang, Larkin, Pengerang, Kota Tinggi, Tangkak, Kluang, Batu Pahat), Selangor (Johan Setia, Shah Alam, Banting), Negeri Sembilan (Nilai, Seremban), Melaka, Pahang, Kuala Lumpur (Cheras), Putrajaya, and Perak (Seri Manjung). Sarawak's Serian remained the nationwide high at 181-182 (unhealthy, not hazardous) by late afternoon. No station nationwide recorded a hazardous or very-unhealthy reading. Separately, the Sarawak Education Department allowed schools in 12 of its 14 haze-affected districts (Kuching, Padawan, Bau, Lundu, Samarahan, Simunjan, Sri Aman, Kanowit, Julau, Meradong, Bintulu and Tatau/Sebauh) to resume normal operations from Sept. 14, while Serian and Lubok Antu schools stay closed until their API readings fall below 200. Indonesia's fire-hotspot count remains the underlying driver: 688 high-confidence hotspots were detected nationally on Sept. 11 (up from 569 a day earlier), with more than 5,000 hotspots scattered nationwide and Bloomberg reporting forecasters expect the unusually dry weather to persist through the end of September.