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Lakhipur, a small town in the Cachar district of Assam, India, occupies a relatively flat terrain at an elevation of approximately 27 meters (89 feet) above sea level. Its coordinates place it within the broader Brahmaputra Valley, a fertile floodplain shaped by the meandering Brahmaputra River. The town is situated near the Bangladesh border, influencing its regional connectivity and economic activities. Surrounding Lakhipur are extensive areas of paddy fields, tea gardens – a defining feature of the Assam landscape – and patches of tropical semi-evergreen forests. The nearby Barak River plays a crucial role in the local hydrology and transportation. While not heavily industrialized, Lakhipur serves as a trading hub for agricultural produce from the surrounding rural areas. The urban-rural gradient is pronounced; the town centre is densely populated, while the periphery quickly transitions into agricultural land. This proximity to agricultural practices, including seasonal burning of crop residue, significantly impacts local air quality. The flat topography and limited natural ventilation contribute to the potential for pollutant accumulation, particularly during periods of calm weather. Dust from unpaved roads and construction activities further adds to particulate matter levels. The humid subtropical climate also encourages the formation of secondary pollutants.

Lakhipur’s air quality follows a distinct seasonal pattern dictated by the monsoon and post-monsoon weather systems. The monsoon season (June to September) generally brings cleaner air due to rainfall washing away pollutants and suppressing dust. However, increased humidity can also foster mold growth, impacting respiratory health. October and November see a gradual deterioration in air quality as the monsoon retreats and agricultural burning intensifies, preparing fields for the Rabi crop. This period often experiences stagnant air conditions, trapping pollutants. Winter (December to February) is typically the worst period for air quality, with cooler temperatures leading to temperature inversions – a layer of warm air trapping cooler, polluted air near the ground. Fog further exacerbates the problem, reducing visibility and concentrating pollutants. March and April witness a slight improvement as temperatures rise and winds pick up, but dust from road construction and drying agricultural fields remains a concern. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the winter and post-monsoon months. Monitoring local weather patterns and avoiding peak pollution times is advisable.