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Jehanabad is a small but strategically positioned city in Bihar's central plains, situated at approximately 25.2200°N, 84.9900°E with an elevation of just 60 meters above sea level. This low-lying location in the fertile Gangetic Plain places it within India's most intensively cultivated agricultural belt, where rice and wheat fields dominate the landscape for miles around. The city lies roughly 50 kilometers south of the Ganges River, with the smaller Falgu River flowing nearby, though these waterways provide minimal air cleansing effects due to their seasonal nature and the region's topography. Jehanabad's urban character reflects a transitional zone between rural villages and larger urban centers like Patna, creating an urban-rural gradient where traditional biomass cooking fuels persist alongside growing vehicular traffic. The flat terrain and lack of significant elevation changes create stagnant air conditions that trap pollutants, while the city's position downwind from agricultural zones means it receives transported smoke from crop burning. This geography creates a perfect storm for poor air quality: surrounded by emission sources with no natural ventilation corridors, situated in a basin-like depression of the Indo-Gangetic Plain where pollutants accumulate rather than disperse, and embedded in an agricultural-industrial matrix where multiple pollution sources converge.

Jehanabad's air quality follows a dramatic seasonal rhythm dictated by the monsoon cycle and winter meteorological conditions. During winter (November-February), pollution reaches hazardous levels as cold temperatures create frequent temperature inversions that trap pollutants near the surface, while dense fog combines with smoke from domestic biomass burning and agricultural residue burning to create toxic smog. These months should be avoided for outdoor exercise, especially by children, elderly, and those with respiratory conditions who should limit exposure and use N95 masks. Spring (March-May) brings gradual improvement as temperatures rise and winds increase, though extreme heat in May can elevate ozone levels and road dust becomes problematic. The monsoon season (June-September) offers the cleanest air as heavy rains wash pollutants from the atmosphere and strong winds provide ventilation, making this the optimal time for outdoor activities. Autumn (October) marks the dangerous transition as farmers burn crop residues and temperatures begin dropping, setting the stage for the winter pollution crisis. Sensitive groups should monitor air quality daily from October through February, plan outdoor activities for midday when pollution is slightly lower, and create clean air spaces indoors with air purifiers during peak pollution episodes.