What caused the API reading to hit 139 in Miri?

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Miri API Reading Reaches Unhealthy Levels Due to Hotspots and Dry Conditions

The Air Pollutant Index (API) in Miri reached an unhealthy level of 139 due to the presence of isolated to scattered hotspots observed in Borneo and Sumatra, exacerbated by persistent dry weather across the southern Asean region. While specific details about the origins of these hotspots in western Kalimantan and central Sumatra were not fully discernible due to cloud cover, the prevailing dry conditions create an environment conducive to their formation and the subsequent spread of smoke haze.
Hotspots Observed in Borneo and Sumatra

The Asean Specialised Meteorological Centre (ASMC) reported observing isolated to scattered hotspots on Borneo and Sumatra through its satellite imagery. These hotspots, particularly noted in western Kalimantan and central Sumatra, were associated with slight, localised smoke plumes. Full visibility of the extent of these hotspots and any resulting haze was partially obscured by cloud cover, according to the ASMC's overnight assessment.
Impact of Dry Weather on Haze Formation

Persistent dry weather conditions across much of the southern Asean region have created a conducive environment for the development and persistence of hotspots. Dry conditions limit the natural suppression of fires and allow for the accumulation of combustible material, thereby increasing the likelihood of fires igniting and spreading. This dry spell is a significant factor contributing to the elevated API readings.
Potential for Transboundary Haze

The ASMC has forecast continued dry conditions for the southern Asean region in the coming days, with the possibility of transboundary haze. While occasional showers are expected in some areas, drier regions may still experience hotspots and smoke haze. The prevailing winds, anticipated to blow from the southeast to south over the southern Asean region, could potentially carry smoke and pollutants across borders, impacting air quality in neighbouring areas like Miri.

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What caused the API reading to hit 139 in Miri?

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