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Parihāra, a small town in Bihar, India, sits at coordinates 25.5378°N, 86.2728°E, within the fertile plains of the Ganges River basin. The terrain is predominantly flat, typical of the Indo-Gangetic Plain, with a low elevation that contributes to the potential for stagnant air masses. Parihāra’s location is deeply intertwined with the agricultural landscape of Bihar, being surrounded by rice paddies and other crop fields. This agricultural activity, while vital to the local economy, introduces particulate matter from crop residue burning and fertilizer use. The Phalgu River, a tributary of the Ganges, flows nearby, but its influence on local air circulation is limited due to the flat topography. While not directly within a major industrial belt, the broader region experiences industrial activity in nearby cities like Gaya, contributing to regional background pollution levels. The urban-rural gradient is sharp; Parihāra itself is a relatively small settlement, but is increasingly connected to larger urban centres. This connectivity brings increased vehicular traffic, a growing source of emissions. The lack of significant natural barriers to wind flow means that pollutants can accumulate easily, particularly during periods of calm weather. The town’s geography, therefore, predisposes it to air quality challenges.

Parihāra’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, often sees the worst conditions. The cessation of monsoon rains coincides with increased agricultural burning to clear fields after the harvest, releasing significant amounts of particulate matter. Cooler temperatures and calm winds create temperature inversions, trapping pollutants near the ground. December and January bring some relief as wind speeds generally increase, dispersing pollutants, but temperatures remain low, potentially exacerbating respiratory issues. The pre-monsoon months, March to May, are characterised by rising temperatures and dust storms, increasing particulate matter concentrations. The onset of the monsoon in June and July brings a significant improvement in air quality as rainfall washes away pollutants and increased humidity suppresses dust. However, increased cloud cover can also lead to reduced sunlight, impacting the breakdown of some pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during October-November and March-May. Avoiding strenuous outdoor activity during peak pollution periods and using appropriate respiratory protection are advisable. Monitoring local conditions is crucial.