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Bihārīganj, a small city nestled within the broader plains of Bihar, India, occupies a geographically significant position. Located at 25.7341°N, 86.9884°E, the city’s terrain is largely flat, characteristic of the Gangetic Plain. This flatness contributes to limited natural dispersion of pollutants. The surrounding landscape is predominantly agricultural, with extensive rice paddies and wheat fields dominating the area. The Phalgu River, a tributary of the Ganges, flows relatively close, influencing local humidity and potentially contributing to localised fog formation during cooler months. Bihārīganj isn’t directly within a major industrial belt, but regional brick kilns and small-scale industrial activity in nearby Gaya contribute to background particulate matter levels. The urban-rural gradient is quite sharp; the city itself is compact with a population of approximately 12,843, quickly transitioning to rural farmland. This proximity to agricultural practices introduces seasonal biomass burning, a significant source of air pollution. The lack of substantial hills or forests hinders natural air filtration. The city’s location within the Indo-Gangetic Plain, known for its stagnant air conditions, exacerbates pollution challenges, trapping pollutants near the ground, especially during winter. This geographical setting demands careful consideration of air quality management strategies.

Bihārīganj experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon climate. The monsoon season (June-September) generally brings improved air quality due to rainfall washing away particulate matter and suppressing dust. However, increased humidity can also foster mold growth, impacting respiratory health. October-November sees a deterioration as the monsoon retreats, and agricultural burning of crop residue intensifies, releasing significant smoke and pollutants. This period, coupled with cooler temperatures and temperature inversions, traps pollutants, creating hazardous conditions. December-February are typically the worst months, with consistently poor air quality due to stagnant air, low wind speeds, and continued biomass burning. Dense fog further exacerbates the problem, reducing visibility and trapping pollutants. March-May sees a gradual improvement as temperatures rise and winds pick up, dispersing pollutants. However, dust storms are common during this period, temporarily increasing particulate matter. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during October-February. Monitoring local weather patterns and avoiding peak pollution times is crucial for protecting health.