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Lathasepura, nestled in the heart of Bihar, India (25.8131° N, 85.7180° E), occupies a geographically significant position within the fertile Gangetic plains. The city’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain, with an average elevation of approximately 58 meters above sea level. This low elevation, coupled with the expansive, relatively level landscape, contributes to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. Lathasepura is surrounded by a mosaic of agricultural land, primarily dedicated to rice and wheat cultivation, which, while vital for the regional economy, can contribute to particulate matter pollution through seasonal burning practices. The city’s proximity to the Ganges River, though providing a crucial water source, also influences local weather patterns, occasionally leading to humidity and fog, which can trap pollutants close to the ground. The urban–rural gradient around Lathasepura is gradual, with small villages and agricultural fields transitioning seamlessly into the city’s periphery. Further afield, the Chota Nagpur Plateau lies to the south, influencing regional wind patterns, though its impact on Lathasepura’s immediate air quality is less pronounced. The lack of significant topographical features limits natural air dispersion, making the city vulnerable to pollution build-up, especially given the increasing vehicular traffic and potential for localized industrial activity within the broader Bihar region. The flat terrain also means that dust storms, common in the region, can have a significant impact on air quality.

Lathasepura’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The dry season, typically spanning from October to May, witnesses a progressive deterioration in air quality. November and December often experience dense fog, a consequence of cooler temperatures and high humidity, which significantly reduces visibility and traps pollutants near the surface. This period is characterized by stagnant air and reduced wind speeds, exacerbating the impact of agricultural burning in surrounding areas. January and February are often the most challenging months, with persistent fog and elevated particulate matter concentrations. The onset of the monsoon season in June brings a welcome respite, as rainfall effectively washes away pollutants and strong winds disperse accumulated emissions. July and August see a marked improvement in air quality, although humidity remains high. The transition months of September and October are variable, with a gradual increase in pollution levels as the monsoon weakens and agricultural activities resume. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of dense fog. Limiting outdoor exertion and using air purifiers indoors are advisable. The monsoon months offer a window for increased outdoor activity, but vigilance is still necessary, as localized pollution events can occur. The agricultural cycle significantly impacts air quality, and awareness of burning practices is crucial for minimizing exposure.