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Kudat, a coastal town in the northernmost region of Sabah, Malaysia, occupies a geographically significant position on the Tip of Borneo. Situated at 6.8837°N, 116.8477°E, the town’s terrain is characterised by a gentle slope descending towards the South China Sea. The surrounding landscape is a mosaic of coastal plains, rolling hills, and lush tropical rainforest, transitioning into agricultural land primarily dedicated to oil palm and rubber plantations. Kudat’s elevation is relatively low, generally under 100 meters, contributing to limited atmospheric dispersion of pollutants. The town’s proximity to the sea introduces a moderating influence on temperature but also facilitates the transport of marine aerosols and potential long-range pollutant advection. While Kudat isn’t a major industrial hub, regional agricultural practices, including open burning for land clearing, contribute to localised air quality concerns. The urban-rural gradient is pronounced; the town centre experiences higher concentrations of vehicle emissions and domestic fuel burning, while surrounding rural areas are more affected by agricultural sources. The prevailing winds, influenced by the monsoon seasons, play a crucial role in pollutant dispersal, often carrying haze from neighbouring regions, particularly during drier periods. This coastal location makes Kudat particularly vulnerable to transboundary pollution events.

Kudat experiences a tropical rainforest climate, defined by distinct wet and dry seasons rather than traditional four seasons. Air quality generally deteriorates during the drier months of February to April, coinciding with the Northeast Monsoon’s waning influence. Reduced rainfall and increased wind speeds from the east can carry haze from Indonesian wildfires, significantly impacting visibility and particulate matter concentrations. This period is best avoided for strenuous outdoor activity, particularly for individuals with respiratory conditions. The wet season, from November to January, typically brings improved air quality due to rainfall scavenging pollutants from the atmosphere. However, increased humidity can foster mould growth, potentially exacerbating allergies. June to September sees relatively stable conditions, with moderate rainfall and calmer winds, offering the most favourable period for outdoor pursuits. Temperature inversions, common during the transition periods between wet and dry seasons, can trap pollutants near the ground, leading to localised air quality stagnation. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular illnesses – should limit prolonged outdoor exposure during haze events and periods of high humidity. Monitoring wind direction is crucial, as pollutants often originate from regional sources.