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Mādhura, a small city nestled within the plains of Bihar, India, at coordinates 26.3388°N, 87.1027°E, presents a unique geographic context influencing its air quality. The city’s elevation is relatively low, typical of the Indo-Gangetic Plain, contributing to limited atmospheric dispersion of pollutants. Mādhura is situated within a predominantly agricultural landscape, characterized by intensive farming practices, particularly rice cultivation, which can contribute to seasonal biomass burning. The Burhi Gandak river flows nearby, though its influence on local air currents is moderated by the flat terrain. The surrounding region is densely populated, with a gradual urban-rural gradient; smaller villages and agricultural lands immediately border the city, transitioning to more extensive farmland further out. This proximity to agricultural activity, combined with potential localized industrial activity typical of growing Indian cities, creates a complex pollution profile. The lack of significant topographical features – hills or mountains – hinders natural ventilation, trapping pollutants during periods of calm weather. Dust from agricultural fields and unpaved roads also contributes significantly to particulate matter concentrations. The city’s position within the Indo-Gangetic Plain, a known hotspot for air pollution, exacerbates these challenges, making Mādhura particularly vulnerable to regional pollution transport.

Mādhura experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon periods. The summer months (April-June) bring high temperatures and stagnant air, leading to a build-up of particulate matter from dust and local emissions. October-November, following the monsoon’s retreat, is often the most polluted period. This is due to the combined effects of post-harvest crop residue burning, cooler temperatures creating temperature inversions that trap pollutants, and reduced wind speeds. The monsoon season (July-September) generally offers temporary relief, as rainfall washes away pollutants and increased wind speeds disperse emissions. However, even during the monsoon, localised flooding can disrupt waste management and contribute to waterborne disease risks. Winter (December-February) sees cool, dry conditions and frequent fog, exacerbating particulate matter concentrations. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during October-February. Avoiding peak hours near roadways and agricultural areas is advisable. During the monsoon, while air quality improves, precautions against waterborne illnesses are crucial. Monitoring local weather patterns and heeding health advisories are essential for protecting respiratory health throughout the year.