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Rāmpur, nestled in the fertile plains of Bihar, India, occupies a geographically significant position within the Ganges River basin. Located at approximately 26.2126° N, 87.2491° E, the city’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain. The elevation is relatively low, contributing to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. Rāmpur’s surrounding landscape is dominated by agricultural land – a patchwork of fields cultivating rice, wheat, and pulses – which, while vital for the regional economy, can contribute to particulate matter pollution through seasonal burning of crop residue. The urban–rural gradient transitions rapidly, with agricultural activities immediately bordering the city limits. While Rāmpur itself lacks major industrial zones within its immediate vicinity, it sits within a broader regional industrial belt extending towards districts like Bhagalpur and Katihar, impacting air quality through transported pollutants. The proximity to the Ganges River, though providing a crucial water source, can also influence local weather patterns and contribute to humidity, which can affect the dispersion of pollutants. The flat topography and prevailing wind patterns, often influenced by regional weather systems, play a crucial role in determining Rāmpur’s air quality profile. The lack of significant natural barriers means that pollutants from distant sources can readily impact the city, compounding local emissions from vehicular traffic and domestic sources. The region's dense population and agricultural practices further exacerbate these challenges.

Rāmpur’s air quality experiences a distinct seasonal cycle dictated by the region’s monsoon climate. The dry season, typically spanning from October to May, presents the most significant air quality challenges. During these months, lower humidity and reduced rainfall lead to a build-up of particulate matter, particularly PM2.5 and PM10, stemming from agricultural burning, vehicular emissions, and construction activities. Temperature inversions, common during the colder months (December-February), trap pollutants near the ground, worsening conditions. November and March often see increased haze and reduced visibility due to these inversions and lingering agricultural smoke. The monsoon season, from June to September, brings relief as rainfall washes away pollutants and strong winds disperse them. However, the onset of the monsoon can initially be accompanied by increased humidity and stagnant air, briefly impacting air quality. The pre-monsoon period (April-May) is often characterized by high temperatures and dry winds, contributing to elevated levels of pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of haze or stagnant air. Outdoor activities are best avoided during the early morning and late evening when pollutant concentrations are typically highest. The post-monsoon period (October) can also experience elevated pollution levels due to the resumption of agricultural activities and the build-up of pollutants before the full onset of the monsoon rains. Maintaining indoor air quality through ventilation and air purifiers is advisable during periods of poor air quality.