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Motihari, situated in Bihar's East Champaran district at coordinates 26.6500°N, 84.9200°E, occupies a strategic position in the fertile Gangetic Plain of northern India. The city lies approximately 60 kilometers north of the Ganges River, with its urban core positioned at a modest elevation of around 62 meters above sea level, creating a flat terrain that extends across the surrounding agricultural landscape. This low-lying topography, characteristic of the Indo-Gangetic Basin, significantly influences air quality by facilitating temperature inversions that trap pollutants close to the ground. Motihari's urban character blends administrative functions with agricultural market services, serving as a district headquarters while being enveloped by intensive farming zones where sugarcane, rice, and wheat dominate. The city's location places it within a broader regional pollution belt stretching across northern India and Nepal, where agricultural burning, industrial emissions, and vehicular pollution converge. Proximity to Nepal's Terai region adds transboundary pollution influences, particularly during seasonal biomass burning episodes. The urban-rural gradient is pronounced, with Motihari's compact urban area transitioning abruptly into vast agricultural fields where crop residue burning occurs extensively. This geographical setting, combined with the city's position downwind of major pollution sources during prevailing northwesterly winter winds, creates a perfect storm for poor air quality, exacerbated by limited natural ventilation from the surrounding flat plains and absence of significant water bodies to moderate pollution dispersion.

Motihari's air quality follows a distinct seasonal pattern shaped by its humid subtropical climate and agricultural calendar. During winter (October-January), pollution peaks dramatically as multiple factors converge: post-monsoon agricultural burning of sugarcane bagasse and rice stubble releases massive particulate plumes, while domestic biomass burning for heating intensifies. Meteorological conditions worsen the situation—cold waves bring temperature inversions that trap pollutants, dense fog reduces dispersion, and calm winds from the northwest carry both local and regional emissions. These months represent the worst period for outdoor activity, particularly for sensitive groups like children, elderly, and those with respiratory conditions who should limit exposure. Spring (February-March) sees gradual improvement as temperatures rise and winds increase, though occasional agricultural burning persists. The summer monsoon (June-September) brings dramatic relief as southwest winds and heavy rainfall effectively scrub the atmosphere, creating the cleanest air of the year ideal for outdoor activities. However, extreme heat poses separate health risks during this period. Autumn (April-May) marks a transition where rising temperatures and pre-monsoon dust storms temporarily degrade air quality before the cleansing rains arrive. Sensitive residents should monitor local air quality advisories year-round, use air purifiers during peak pollution months, and schedule outdoor activities for early mornings when pollution levels are typically lower, especially during the hazardous winter period.