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Mānjhi, a small town in the Patna division of Bihar, India, sits at coordinates 25.8384°N, 84.5788°E. The town’s geography is characteristic of the Indo-Gangetic Plain – a flat, fertile alluvial landscape. Situated at a relatively low elevation, typical of the region, Mānjhi is part of a densely populated agricultural belt. The surrounding terrain is predominantly farmland, primarily dedicated to rice and wheat cultivation, interspersed with small pockets of deciduous forests. The Son River flows relatively close, influencing local humidity and potentially contributing to localised fog formation during cooler months. While not directly within a major industrial zone, the broader Patna region experiences industrial activity, and prevailing winds can transport pollutants towards Mānjhi. The urban-rural gradient is sharp; Mānjhi itself is a relatively small settlement, quickly transitioning to rural agricultural land. This proximity to agricultural practices introduces sources of particulate matter from crop residue burning and fertilizer use. The lack of significant topographical features hinders natural dispersion of pollutants, making Mānjhi susceptible to air quality issues, particularly during periods of calm weather. The town’s location within the Indo-Gangetic Plain, a known hotspot for air pollution, exacerbates these challenges.

Mānjhi’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, often sees a significant deterioration in air quality. The burning of crop residue after the harvest, combined with cooler temperatures and stagnant air, leads to high concentrations of particulate matter. Winter, from December to February, brings temperature inversions, trapping pollutants near the ground and worsening conditions. Fog, common during these months, further reduces visibility and exacerbates respiratory problems. March and April witness increasing temperatures and dust storms, contributing to higher levels of coarser particulate matter. The pre-monsoon season, May to June, is generally slightly better, with occasional dust storms. The monsoon season, from July to September, offers a temporary respite as rainfall washes away pollutants and increased humidity suppresses dust. However, increased cloud cover can also trap pollutants at lower altitudes. Sensitive groups – children, the elderly, and those with respiratory illnesses – should limit outdoor activity during October-November and December-February. Avoiding peak hours and wearing masks can offer some protection. Monitoring local conditions and heeding health advisories is crucial throughout the year, but particularly during these periods.