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Madānpur, a small city nestled within the state of Bihar, India, occupies a relatively flat expanse of the Indo-Gangetic Plain at coordinates 25.8670°N, 86.7875°E. Its elevation is characteristically low for the region, contributing to limited atmospheric dispersion of pollutants. The surrounding landscape is predominantly agricultural, dominated by rice paddies and wheat fields, typical of Bihar’s fertile plains. The Phalgu River, a tributary of the Ganges, flows nearby, influencing local humidity and potentially contributing to localised fog formation during cooler months. While Madānpur itself isn’t a major industrial hub, its position within a wider network of smaller towns and villages means it’s susceptible to regional pollution transport. The urban-rural gradient is quite sharp; the city’s core is densely populated, transitioning rapidly to agricultural land. This proximity to agricultural practices introduces seasonal biomass burning, a significant source of particulate matter. The lack of substantial topographical features – hills or mountains – hinders natural ventilation, trapping pollutants close to the ground. Dust from unpaved roads and construction activities further exacerbates the situation, particularly during the drier seasons. The city’s air quality is therefore heavily influenced by local agricultural practices, regional transport, and limited natural dispersion capabilities.

Madānpur’s air quality follows a distinct seasonal pattern dictated by the monsoon and post-monsoon weather systems. The monsoon season (June-September) generally brings temporary relief, as rainfall effectively washes away particulate matter and increased humidity suppresses dust. However, stagnant conditions can also occur during periods of reduced rainfall, leading to localised pollution build-up. October-November sees a deterioration in air quality as post-monsoon conditions prevail, with cooler temperatures and calmer winds favouring temperature inversions – trapping pollutants near ground level. This period coincides with the burning of crop residue after the harvest, significantly increasing particulate matter concentrations. Winter (December-February) is typically the worst period for air quality, with consistently low temperatures, frequent fog, and minimal wind dispersal. March-May brings rising temperatures and increasing dust storms, contributing to higher levels of coarser particulate matter. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during the winter and post-monsoon months. The best time for outdoor activity is generally during the monsoon season, though awareness of localised stagnant conditions is still advised. Monitoring wind direction and avoiding peak agricultural burning times are crucial for mitigating exposure.