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Tangkak, a town nestled in the state of Johor, Malaysia, occupies a strategically important position within the southwestern region of the country. Located at approximately 2.2673° N, 102.5453° E, Tangkak’s geography is characterized by a gently undulating terrain, transitioning from low-lying plains closer to the coast to slightly elevated ground further inland. The town sits near the Muar River, a significant waterway that influences local climate and provides a vital transportation route. Tangkak’s urban fabric is a blend of traditional shop houses and more modern developments, reflecting its growth from a historical trading post to a contemporary town. The surrounding landscape is predominantly agricultural, with extensive oil palm plantations and rubber estates dominating the rural areas. This agricultural intensity contributes to localized air quality considerations, particularly concerning biomass burning during land clearing and harvesting periods. Further afield, Johor Bahru, a major industrial and commercial hub, exerts an influence on Tangkak’s air quality, with potential for transboundary pollution events. The urban-rural gradient is relatively sharp, with the agricultural zones quickly enveloping the town. Elevation is generally low, rarely exceeding 30 meters above sea level, which can exacerbate the trapping of pollutants under certain meteorological conditions. The proximity to the Straits of Malacca also introduces the possibility of marine-borne particulate matter impacting air quality, though this is typically less significant than terrestrial sources. The town’s location within a humid tropical climate further complicates air quality dynamics.

Tangkak’s tropical climate dictates a wet and dry season pattern, significantly influencing its air quality profile. The dry season, typically spanning from March to September, often sees a gradual increase in particulate matter concentrations. This is largely attributable to increased agricultural activity, including controlled burning for land preparation and clearing of vegetation, a common practice in the surrounding oil palm and rubber plantations. Reduced rainfall during this period also limits the natural cleansing effect of precipitation, allowing pollutants to persist longer. The monsoon season, from October to February, brings increased rainfall and higher humidity, generally leading to improved air quality as pollutants are washed from the atmosphere. However, periods of prolonged fog, common during the northeast monsoon, can trap pollutants near the ground, creating localized episodes of reduced visibility and potentially elevated exposure. Temperature inversions, though less frequent than in temperate climates, can occasionally occur, particularly during cooler nights, further hindering vertical mixing and concentrating pollutants. The months of August and September often present the most challenging conditions due to a combination of dry weather and heightened agricultural activity. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting prolonged outdoor exertion. During the monsoon season, while overall air quality tends to be better, periods of dense fog necessitate careful monitoring and reduced outdoor activity, especially for those with pre-existing respiratory ailments. Maintaining indoor air quality through proper ventilation and air purification can be beneficial throughout the year.