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Lakhna, Bihar, situated at approximately 25.45°N, 85.14°E, occupies a geographically significant position within the fertile Gangetic plains of eastern India. The town’s terrain is predominantly flat, characteristic of the Indo-Gangetic alluvial plain, resulting in minimal elevation changes – a factor that can exacerbate air quality issues by limiting natural dispersion of pollutants. Lakhna lies within a region heavily influenced by the Ganges River basin, though the town itself is not directly adjacent to the river; its proximity, however, means it’s subject to the broader hydrological and meteorological patterns of the region. The surrounding landscape is dominated by agricultural land, primarily rice and maize cultivation, interspersed with smaller villages and scattered rural settlements. This creates a distinct urban–rural gradient, with Lakhna representing a small, localized urban center within a largely agrarian setting. The region’s climate is subtropical, with hot, humid summers and cool, dry winters. Significant industrial activity is limited within Lakhna itself, but the broader Bihar region experiences industrial development concentrated in areas further west, potentially contributing to transboundary pollution. The flat topography and prevailing wind patterns often lead to stagnant air conditions, particularly during cooler months, hindering the natural cleansing of the atmosphere. The dense population in surrounding rural areas, coupled with agricultural practices like stubble burning (though regulated), can also contribute to localized air pollution episodes. The lack of significant natural barriers further compounds these challenges, allowing pollutants to accumulate.

Lakhna’s air quality follows a distinct seasonal pattern dictated by the region’s subtropical monsoon climate. The pre-monsoon season (March-May) typically witnesses the poorest air quality. High temperatures and low wind speeds create stable atmospheric conditions, frequently leading to temperature inversions where cooler air is trapped near the ground, preventing pollutants from rising and dispersing. This period often coincides with agricultural activities, including residue burning after the harvest, which significantly elevates particulate matter concentrations. The monsoon season (June-September) brings relief as strong winds and frequent rainfall effectively flush out pollutants, leading to a noticeable improvement in air quality. However, heavy rainfall can also lead to increased humidity and the release of biogenic volatile organic compounds (BVOCs) from vegetation, which can contribute to ozone formation under certain conditions. The post-monsoon season (October-November) mirrors the pre-monsoon period, with cooler temperatures and reduced wind speeds again fostering stagnant air and a resurgence of pollution, often exacerbated by agricultural burning. Winter months (December-February) are generally characterized by colder temperatures and dense fog, which further restricts atmospheric mixing and traps pollutants close to the ground. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, limiting outdoor exertion and wearing appropriate masks. The monsoon months offer the most favourable period for outdoor activities, though vigilance regarding humidity-related health concerns remains important.