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Muzaffarpur occupies a strategic position in northern Bihar's Gangetic Plain, situated approximately 70 kilometres north of the Ganges River and 35 kilometres from the Burhi Gandak River. This low-lying city rests at an elevation of just 60 metres above sea level, placing it within one of South Asia's most densely populated and agriculturally intensive regions. The urban character of Muzaffarpur reflects its role as a major commercial hub for the surrounding litchi belt, with a distinct urban-rural gradient where the city's built environment gradually gives way to extensive agricultural fields. This geography creates a perfect storm for air quality challenges: the flat terrain inhibits natural ventilation, while the city's position within the Indo-Gangetic Plain traps pollutants between the Himalayas to the north and the Vindhya Range to the south. The surrounding landscape consists predominantly of fertile alluvial soil that generates significant road dust when dry, compounded by the region's brick kilns that cluster around urban fringes. Proximity to multiple rivers contributes to high humidity that facilitates particulate matter formation, while the agricultural zones encircling the city become sources of seasonal biomass burning. This geographic setting essentially creates a natural bowl where emissions from vehicles, industry, and agriculture accumulate with limited dispersion pathways.

Muzaffarpur's air quality follows a dramatic seasonal rhythm dictated by the region's humid subtropical climate. During winter months from November through February, pollution reaches its peak as cold temperatures create frequent temperature inversions that trap pollutants near the surface. Dense fog, particularly in December and January, combines with emissions from brick kilns, vehicle exhaust, and domestic biomass burning to create hazardous conditions. Sensitive groups should avoid prolonged outdoor exposure during these months, especially morning hours when fog and inversion layers are strongest. The pre-monsoon period from March to May brings extreme heat that accelerates photochemical reactions, though occasional dust storms provide temporary ventilation. June through September offers the cleanest air as the southwest monsoon arrives with strong winds and heavy rainfall that effectively scrub pollutants from the atmosphere. This represents the optimal period for outdoor activities. Post-monsoon months of October and early November see rapidly deteriorating conditions as agricultural burning in the surrounding litchi belt coincides with decreasing wind speeds and the onset of inversion conditions. Throughout the year, residents should monitor local air quality advisories and plan outdoor activities for midday during cleaner seasons when atmospheric mixing is typically strongest.