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Keningau, nestled in the interior of Sabah, Malaysia, occupies a unique geographic position within the Crocker Range. Situated at approximately 5.3378°N, 116.1602°E, the town’s elevation of around 488 meters (1601 feet) significantly influences its climate and, consequently, its air quality. Unlike coastal Sabahan cities, Keningau experiences less maritime influence, resulting in a more continental-like climate. The surrounding landscape is dominated by rolling hills, dense rainforest, and agricultural land, primarily rubber and oil palm plantations. These plantations, while economically vital, contribute to potential particulate matter pollution through land clearing and burning activities, particularly during drier periods. The urban-rural gradient is relatively sharp; Keningau itself is a growing urban centre, but quickly transitions to rural landscapes and forested areas. The terrain funnels winds through the valleys, potentially trapping pollutants during periods of low wind speed and temperature inversions. The absence of a major industrial belt within Keningau itself is a positive factor, but regional haze from Indonesian forest fires can significantly impact air quality, transported by prevailing winds. Proximity to the interior mountains also limits air dispersion, exacerbating pollution events. The Kinabatangan River, while not immediately adjacent, influences regional humidity and rainfall patterns.

Keningau’s air quality follows a distinct wet and dry season pattern, dictated by the northeast monsoon. The wet season, generally from November to February, brings frequent rainfall which effectively scrubs the atmosphere, leading to improved air quality. Higher humidity during this period can, however, promote the formation of mould spores, potentially impacting respiratory health. The driest months, typically March to May, coincide with increased agricultural activities, including land clearing and burning for plantation management. This often results in a peak in particulate matter (PM2.5 and PM10) concentrations. June to October represents a transitional period with fluctuating rainfall and moderate air quality. Temperature inversions, common in the mornings, can trap pollutants near ground level, particularly in the valley areas. Regional haze from Indonesian wildfires is most prevalent during the drier months, significantly degrading air quality. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during March-May and periods of visible haze. Monitoring wind direction is crucial; winds from the southwest often carry pollutants from neighbouring regions. Avoiding outdoor exercise during peak hours and wearing masks can offer protection.