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Galhinna, nestled in the Central Province of Sri Lanka at coordinates 7.4162, 80.5639, is a small town of approximately 18,507 residents. Its geography is defined by the rolling hills and lush tea plantations characteristic of this region, situated within the Knuckles Conservation Corridor. The terrain is significantly elevated, contributing to cooler temperatures than coastal areas, but also influencing air circulation patterns. Galhinna isn’t directly adjacent to major bodies of water, though numerous streams and rivers originate in the surrounding highlands, feeding into larger systems. The urban-rural gradient is quite sharp; the town itself is relatively compact, quickly giving way to dense forest and agricultural land. While not a major industrial hub, the surrounding areas support small-scale tea processing and rubber production, alongside subsistence farming. This agricultural activity, particularly the use of fertilizers and biomass burning for land preparation, contributes to localised air pollution. The town’s position within a valley can exacerbate pollution events, trapping pollutants during periods of calm weather. The prevailing winds, influenced by the monsoon seasons and the topography, play a crucial role in dispersing or concentrating airborne particles. Understanding these geographical factors is vital for assessing and mitigating air quality challenges in Galhinna.

Galhinna experiences a tropical monsoon climate, dictating a distinct wet and dry season rather than traditional four seasons. Air quality generally improves during the wet season (May to September) as rainfall effectively washes particulate matter from the atmosphere. However, increased humidity can also foster mould growth, impacting respiratory health. The southwest monsoon brings consistent rainfall and winds, dispersing pollutants, making these months generally favourable for outdoor activity. Conversely, the dry season (December to March) sees a significant deterioration in air quality. Reduced rainfall allows pollutants from agricultural practices – particularly tea estate biomass burning for field preparation – and vehicle emissions to accumulate. Temperature inversions, common during the cooler mornings of the dry season, trap pollutants near ground level. February and March are typically the worst months. October and November represent transitional periods with fluctuating conditions. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit strenuous outdoor activity during the dry season and monitor their health closely. Increased dust from agricultural activities also contributes to poorer air quality during this period.