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Lakhnaur, a small town in the Bihar plains of India (26.2020°N, 86.3090°E), occupies a low-lying position within the Gangetic alluvium. The terrain is remarkably flat, characteristic of the Indo-Gangetic Plain, with an elevation hovering around 60 meters above sea level. This flatness contributes to limited natural dispersion of pollutants. Lakhnaur is situated within a predominantly agricultural landscape, heavily reliant on rice and wheat cultivation, with smaller pockets of sugarcane and maize. The town’s air quality is significantly influenced by this surrounding agricultural activity, particularly during post-harvest burning of crop residue. The proximity to larger urban centres like Patna (approximately 100km to the east) and Muzaffarpur (around 70km to the north) means Lakhnaur is increasingly affected by regional pollution transport. The Burhi Gandak river flows relatively close, but its influence on local air circulation is limited due to the flat topography. The urban-rural gradient is sharp; Lakhnaur itself is a relatively small settlement, quickly transitioning to rural farmland. Dust from unpaved roads and agricultural fields is a constant contributor to particulate matter, exacerbated by seasonal wind patterns. The lack of significant industrial activity within Lakhnaur itself doesn’t preclude the impact of industrial emissions from nearby areas carried by prevailing winds.

Lakhnaur experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon periods. The monsoon season (June-September) generally brings temporary relief, as rainfall effectively washes away particulate matter and suppresses dust. However, high humidity can also foster mould growth, potentially impacting respiratory health. October-November marks a critical period of deterioration. Post-monsoon calm winds combined with temperature inversions trap pollutants, and crucially, this coincides with widespread agricultural burning of rice stubble, dramatically increasing PM2.5 levels. This is the least favourable time for outdoor activity, particularly for those with pre-existing respiratory or cardiovascular conditions. December-February sees cooler temperatures and often foggy conditions, further exacerbating pollution as inversions are more frequent and vertical mixing is reduced. March-May brings rising temperatures and increasingly dry conditions, leading to dust storms and a gradual increase in particulate matter. While the monsoon offers respite, the period immediately preceding and following it presents the most significant air quality challenges. Sensitive groups – children, the elderly, and those with respiratory illnesses – should limit outdoor exposure during these peak pollution months.