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Arniya, a small town in Bihar, India, sits at coordinates 25.7150°N, 85.5448°E, within the fertile plains of the Ganges River basin. The surrounding landscape is predominantly agricultural, characterized by rice paddies and wheat fields, typical of the Indo-Gangetic Plain. Arniya’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. The town’s position isn’t directly adjacent to a major river, though it benefits from the broader alluvial soil deposits and groundwater recharge from the Ganges and its tributaries. The urban-rural gradient is sharp; Arniya is a localized settlement embedded within a largely rural agricultural matrix. While not a major industrial hub itself, Arniya’s air quality is influenced by regional industrial activity concentrated further west towards Patna and the broader Bihar industrial corridor. Brick kilns, common throughout the region, are a significant localised source of particulate matter. Dust from agricultural practices, particularly during harvest seasons, also contributes to baseline pollution levels. The flat terrain restricts wind flow, exacerbating pollutant concentration, especially during periods of temperature inversion. The town’s small size means emissions are relatively concentrated, impacting local air quality more acutely than in larger, more dispersed cities.

Arniya’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, often sees the worst conditions. Stagnant air, coupled with the burning of crop residue after the harvest, leads to a significant spike in particulate matter. Temperature inversions are common during these cooler months, trapping pollutants near the ground. December and January bring some relief as wind speeds increase, but cold temperatures can still exacerbate respiratory issues. The pre-monsoon months, March to May, witness rising temperatures and dust storms, increasing particulate matter concentrations. The arrival of the monsoon in June offers a substantial improvement in air quality, as rainfall washes away pollutants and increased humidity suppresses dust. However, increased humidity can also foster mold growth, impacting those with respiratory sensitivities. September sees a gradual deterioration as the monsoon weakens. For those with asthma or other respiratory conditions, avoiding outdoor activity during October-November and March-May is advisable. Staying indoors during dust storms and monitoring local conditions are crucial. The monsoon months generally offer the most favourable conditions for outdoor activity.