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Dhekiajuli, nestled in the Sonitpur district of Assam, India, occupies a unique geographic position within the foothills of the Himalayas. Located at coordinates 26.7037°N, 92.4781°E, the town sits at an elevation of approximately 80 meters above sea level, contributing to a relatively flat terrain. The surrounding landscape is dominated by lush tea gardens, paddy fields, and patches of deciduous forests, characteristic of the Brahmaputra Valley. The town’s proximity to the Brahmaputra River, though not immediately adjacent, influences local humidity and temperature patterns. Dhekiajuli isn’t a major industrial hub, but regional brick kilns and small-scale tea processing contribute to particulate matter emissions. The urban-rural gradient is pronounced; the town itself is a relatively small settlement surrounded by extensive agricultural land. This proximity to agricultural practices introduces seasonal biomass burning, particularly after harvests, impacting local air quality. The terrain, while generally flat, features subtle undulations that can create localized pockets where pollutants accumulate, especially during temperature inversions. The prevailing winds, influenced by the Himalayan range, play a crucial role in dispersing or trapping pollutants. Understanding this interplay of geography and local activities is vital for assessing and mitigating air quality concerns in Dhekiajuli.

Dhekiajuli’s air quality follows a distinct seasonal pattern dictated by the monsoon and post-monsoon conditions. The monsoon season (June-September) generally brings improved air quality due to rainfall washing away particulate matter and suppressing dust. However, increased humidity can also foster mold growth, potentially affecting respiratory health. October-November sees a deterioration in air quality as the monsoon recedes, and agricultural burning of crop residue becomes prevalent, releasing significant amounts of smoke and particulate matter. This period is often the most challenging for those with respiratory sensitivities. Winter (December-February) experiences cooler temperatures and often, temperature inversions, trapping pollutants near the ground, particularly from domestic wood and biomass burning. Fog can exacerbate this, reducing visibility and increasing pollutant concentrations. March-May marks a transition period, with rising temperatures and increasing dust levels as the land dries. Pre-monsoon showers offer temporary relief, but overall, air quality tends to worsen. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during October-November and December-February. Monitoring local conditions and using appropriate respiratory protection is advisable during these peak pollution periods.