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Tanjung Morawa, nestled in the province of North Sumatra, Indonesia, occupies a geographically strategic, yet environmentally sensitive position. Located at coordinates 3.5167°S, 98.7833°E, the city sits within the Medan metropolitan area, functioning as a key industrial and agricultural hub. The terrain is predominantly flat, characteristic of the coastal plains of Sumatra, with a low elevation that contributes to limited natural air dispersion. Tanjung Morawa is situated inland, but relatively close to the Strait of Malacca, influencing humidity levels and occasionally, wind patterns. Surrounding the urban core are extensive palm oil plantations and rubber estates, alongside burgeoning industrial zones focused on food processing, textiles, and increasingly, light manufacturing. This blend of agriculture and industry is a significant driver of local air quality challenges. The urban-rural gradient is rapidly blurring as the city expands, encroaching upon agricultural land. The proximity to Medan, a major urban centre, also means Tanjung Morawa experiences spillover effects from regional pollution sources. The Deli River flows nearby, potentially acting as a pathway for pollutant transport, and its water quality is intrinsically linked to industrial discharge. Understanding this interplay of landscape, industry, and proximity is crucial for addressing air quality concerns.

Tanjung Morawa experiences a tropical rainforest climate, defined by two primary seasons: a wet season (October to January) and a dry season (June to September). Air quality generally deteriorates during the dry season. Reduced rainfall means less atmospheric cleansing, allowing pollutants from industrial activity and agricultural burning to accumulate. The dry season also coincides with increased land clearing for plantation expansion, often involving slash-and-burn techniques, releasing significant particulate matter. Temperature inversions, common during the calmer mornings of the dry season, trap pollutants near ground level, exacerbating the problem. The wet season offers temporary relief, as rainfall washes pollutants from the air. However, even during the wet season, localised pollution hotspots can persist near industrial areas. February to May represents a transitional period with fluctuating conditions. Sensitive individuals – children, the elderly, and those with respiratory conditions – should be particularly cautious during the peak of the dry season (July-August). Monitoring wind direction is important; winds from the south and southwest often carry smoke from agricultural fires. Avoiding strenuous outdoor activity during periods of haze is advisable, and using N95 masks can offer some protection.