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Mekra, a small town in Bihar, India, sits at coordinates 25.4705°N, 85.8406°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. The terrain is remarkably flat, with a very gentle slope towards the Ganges, influencing drainage patterns and potentially contributing to localised humidity. Mekra’s elevation is relatively low, around 75 meters above sea level, making it susceptible to stagnant air conditions. The town’s position isn’t directly adjacent to a major river, but is within the broader floodplain, meaning seasonal flooding can occur. While not a major industrial hub itself, Mekra is situated within a region experiencing increasing industrial activity in nearby cities like Patna, contributing to regional pollution transport. The urban-rural gradient is sharp; Mekra represents a relatively small settlement embedded within a largely agrarian landscape. This proximity to agricultural practices introduces sources of particulate matter from crop residue burning and fertilizer use. The lack of significant natural barriers to wind flow means pollutants can accumulate during periods of low wind speed, exacerbating air quality issues. The town’s small size limits its ability to implement large-scale mitigation strategies independently.

Mekra’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, often sees the worst conditions. The receding monsoon leaves behind stagnant air, coupled with increased burning of agricultural residue after the harvest, leading to high levels of particulate matter. Temperature inversions are common during these cooler months, trapping pollutants near the ground. December and January bring some relief due to slightly stronger winds, but temperatures remain low, potentially worsening the impact of wood and biomass burning for heating. The pre-monsoon months, March to May, witness a gradual deterioration as temperatures rise and dust storms become more frequent, increasing coarse particulate matter. The monsoon season, from June to September, generally offers the cleanest air. Heavy rainfall effectively washes away pollutants, and increased humidity suppresses dust. However, increased cloud cover can also contribute to temperature inversions. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during October-November and March-May. Staying indoors during peak pollution times and using air purifiers are recommended. Monitoring local conditions is crucial, as weather patterns can shift rapidly.