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Salīmpur, located in Uttar Pradesh's eastern plains at coordinates 26.3000°N, 83.9167°E, occupies a strategic position in the densely populated Gangetic Plain. Situated approximately 200 kilometers east of Varanasi and 100 kilometers northwest of Gorakhpur, this mid-sized urban center lies within the fertile agricultural belt that defines this region's economy. The terrain is uniformly flat with an elevation around 70 meters above sea level, creating minimal natural ventilation corridors that can trap pollutants. Salīmpur's urban character blends traditional market town functions with emerging small-scale industries, positioned along transportation routes connecting larger cities. The city sits approximately 30 kilometers south of the Ghaghara River, one of the Ganges' major tributaries, though this proximity provides limited air quality benefits due to the river's seasonal flow patterns. Surrounded by intensive rice and wheat cultivation, agricultural burning contributes significantly to the pollution mix. The urban-rural gradient shows decreasing pollution levels moving outward from the city center, but regional haze often blankets the entire area due to the combination of local emissions and transported pollution from the broader Indo-Gangetic Plain. This geographic positioning in one of the world's most polluted airsheds means Salīmpur experiences compounded air quality challenges from both its own urban activities and the regional atmospheric basin effects.

Salīmpur's air quality follows distinct seasonal patterns shaped by the monsoon climate of eastern Uttar Pradesh. Winter months from November to February bring the most hazardous conditions, with pollution peaking typically in December and January. During this period, cold temperatures combine with frequent temperature inversions that trap pollutants close to the ground, while calm winds and dense fog create a persistent haze. Agricultural residue burning in surrounding fields adds to urban emissions, creating a toxic mix that lingers for days. Sensitive groups should minimize outdoor activities during these months, especially during morning hours when inversion layers are strongest. Spring from March to May sees gradual improvement as temperatures rise and winds increase, though occasional dust storms from the Thar Desert can cause temporary spikes. The monsoon season from June to September brings dramatic relief as heavy rains wash pollutants from the air and strong southwesterly winds provide ventilation. This period offers the best conditions for outdoor activities. Post-monsoon October experiences a rapid deterioration as agricultural burning resumes and meteorological conditions become favorable for pollution accumulation. Residents with respiratory conditions should monitor local air quality reports closely during transition periods and consider using air purifiers indoors during peak pollution episodes.