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Arerāj, nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 26.5527° N, 84.6726° E, the city’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain, with an elevation of roughly 58 meters above sea level. This low-lying topography contributes to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. Arerāj is surrounded by a landscape dominated by agricultural fields – primarily rice and wheat cultivation – which, while vital for the regional economy, can contribute to particulate matter pollution through seasonal burning practices. The city’s proximity to the Ganges River, though offering a crucial water source, also influences local weather patterns and can, under certain conditions, trap pollutants. The urban–rural gradient around Arerāj is relatively gradual, with small villages and agricultural land seamlessly blending into the urban fabric. While not directly adjacent to major industrial belts, Arerāj’s location within Bihar places it within reach of industrial activity in areas like Barauni and Munger, potentially impacting air quality through long-range transport of pollutants. The flat, expansive nature of the surrounding plains limits natural dispersion of pollutants, and the lack of significant topographical features exacerbates the challenges in maintaining clean air. The region's climate, characterized by hot summers and a distinct monsoon season, further complicates air quality management.

Arerāj’s air quality experiences a distinct seasonal cycle heavily influenced by regional weather patterns. The pre-monsoon months (March-May) typically see the poorest air quality, driven by rising temperatures, stagnant air, and agricultural burning. Farmers often clear crop residue through controlled burns, releasing significant amounts of particulate matter and other pollutants into the atmosphere. Temperature inversions, common during this period, trap pollutants near the ground, worsening conditions. The monsoon season (June-September) brings relief as increased rainfall and stronger winds naturally cleanse the air, dispersing pollutants and reducing their concentration. However, heavy rainfall can also lead to increased humidity and the formation of secondary pollutants. Post-monsoon (October-November) often mirrors the pre-monsoon period, with cooler temperatures and a return to agricultural burning practices, leading to another peak in pollution. Winter months (December-February) are generally characterized by colder temperatures and frequent fog, which can trap pollutants and reduce visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, limiting outdoor activity during peak pollution periods. The combination of agricultural practices, meteorological conditions, and the city’s geographic setting creates a complex interplay that dictates Arerāj’s air quality throughout the year. Avoiding outdoor exertion during foggy winter mornings and periods of agricultural burning is advisable.