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Kotia, a small town in Bihar, India, sits at coordinates 26.2750°N, 86.0532°E, within the Indo-Gangetic Plain. This vast, fertile expanse is characterized by relatively flat terrain, a legacy of alluvial deposits from the Ganges and its tributaries. Kotia’s elevation is low, contributing to limited atmospheric dispersion of pollutants. The surrounding landscape is predominantly agricultural, with rice paddies and wheat fields dominating the rural areas immediately bordering the town. This agricultural activity, while vital to the local economy, introduces sources of particulate matter through crop residue burning and fertilizer use. The town’s position isn’t near any major industrial belts, but regional brick kilns and smaller-scale industrial activity contribute to background pollution levels. The urban-rural gradient is sharp; Kotia itself is a concentrated settlement amidst a largely agrarian landscape. The lack of significant natural barriers like hills or forests hinders the flushing out of pollutants. Proximity to the Kosi River, while providing irrigation, also creates conditions for humidity and potential fog formation, trapping pollutants during cooler months. The flat topography and limited wind corridors exacerbate the concentration of airborne particles, making Kotia particularly vulnerable to air quality issues.

Kotia experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon cycles. The monsoon season (June-September) generally offers temporary relief, as rainfall washes away particulate matter and increased humidity suppresses dust. However, stagnant conditions can also develop, trapping pollutants locally. October-November sees a deterioration in air quality as post-monsoon conditions bring cooler temperatures and temperature inversions, preventing vertical mixing of air. This period coincides with increased agricultural burning after the harvest, significantly elevating particulate matter levels. Winter (December-February) is typically the worst period, with consistently poor air quality due to low wind speeds, frequent fog, and continued burning of biomass for heating and cooking. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these months. March-May brings rising temperatures and increasing dust levels, though wind speeds may offer some dispersal. Avoiding outdoor exertion during peak heat hours is advisable. Overall, the months of October through February present the greatest challenges for respiratory health in Kotia, demanding heightened awareness and preventative measures.