Authorities in Malaysia's Sarawak state activated an operations room and tightened controls on open burning on Monday after air quality in Serian reached an unhealthy level and satellite monitoring showed a sharp concentration of fire hotspots across the border in Indonesian Kalimantan. The state Natural Resources and Environment Board warned that smoke pollution could worsen in the coming days if biomass burning outside Sarawak intensifies.
Serian registered an Air Pollutant Index reading of 153 at 4 p.m. local time on July 27, according to the board. Under Malaysia's index, readings from 101 to 200 are classified as unhealthy. Seven other monitoring areas in Sarawak reported moderate readings between 51 and 100, while five remained in the good range below 50. The board said readings across the state had generally trended upward since July 10.
Data cited by the board from the ASEAN Specialised Meteorological Centre identified 1,081 hotspots in Kalimantan between July 1 and July 26, including 442 during the latest five-day period. Sarawak recorded 16 hotspots over the full period and only one during the latest seven days. Hotspots are satellite-detected thermal anomalies that can indicate fires, although monitoring agencies normally assess them alongside smoke and weather data.
The regional risk is being shaped by the Southwest Monsoon, which Malaysia entered on May 14 and which is expected to continue until September. Prevailing southwesterly winds can carry smoke from burning areas toward western Sarawak. The environment board said this pattern creates the potential for transboundary haze and a further deterioration in ambient air quality if fires expand beyond the state's borders.
In response, the board revoked previously approved permits for controlled burning, suspended the issue of new permits and sent prohibition notices on open burning to project developers. It also asked residents to avoid all open burning, help extinguish small fires when safe and report incidents to local authorities. A conviction for illegal open burning under Sarawak's environmental ordinance can bring a fine of up to 100,000 ringgit, five years in prison, or both.
Officials will continue tracking air readings, satellite hotspots and wind conditions to determine whether the warning develops into a wider haze episode. The large disparity between hotspot counts in Kalimantan and Sarawak makes cross-border transport a central concern, but the board framed the outlook as conditional on burning intensifying. Its immediate measures are intended to limit local smoke sources while regional monitoring clarifies the direction and severity of the pollution.
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