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Bokākhāt, nestled in the Golaghat district of Assam, India, occupies a unique geographic position within the Brahmaputra Valley. Situated at coordinates 26.6402°N, 93.6005°E, the town lies at an elevation of approximately 98 meters (322 feet) above sea level. This relatively low-lying terrain contributes to the potential for stagnant air masses, particularly during calmer weather conditions. The surrounding landscape is dominated by lush tea gardens, interspersed with patches of tropical semi-evergreen forests and agricultural land. Bokākhāt’s proximity to the Kaziranga National Park, a UNESCO World Heritage site, highlights the ecological sensitivity of the region. The town is not directly adjacent to a major river, but benefits from the broader hydrological network of the Brahmaputra basin, influencing local humidity and rainfall patterns. While not a heavily industrialized hub, Bokākhāt supports local industries related to tea processing and timber, alongside a growing commercial sector. The urban-rural gradient is pronounced, with a rapid transition from the town centre to surrounding villages and agricultural areas. This gradient impacts air quality as biomass burning in rural areas can contribute to particulate matter concentrations in Bokākhāt itself, especially during the dry season. The valley’s topography can also channel winds, influencing pollutant dispersion.

Bokākhāt experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, roughly November to April, sees consistently lower humidity and reduced rainfall, leading to increased dust and particulate matter from construction, road traffic, and agricultural activities. January and February are typically the clearest months, but also see temperature inversions forming in the mornings, trapping pollutants near the ground. The pre-monsoon period (April-May) brings rising temperatures and occasional strong winds, temporarily dispersing pollutants, but also increasing the risk of wildfires in nearby forests, contributing to smoke haze. The monsoon season, from June to September, offers a significant improvement in air quality due to frequent rainfall washing away pollutants. However, increased humidity can also promote the growth of mold and allergens. October marks a transition period with decreasing rainfall and a gradual build-up of pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly in January and February. During the monsoon, while air is cleaner, precautions against waterborne diseases are crucial. Avoiding peak traffic hours and using masks during dusty periods are recommended.