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Jasauli, nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 26.4996° N, 84.8171° E, the town’s elevation is relatively low, around 118 meters (387 feet) above sea level, contributing to a tendency for pollutants to accumulate. The surrounding landscape is predominantly agricultural, characterized by expansive fields of rice, wheat, and maize – a typical feature of the Indo-Gangetic Plain. This intensive agricultural activity, while vital for the regional economy, introduces significant sources of particulate matter through crop residue burning, particularly during the post-harvest season. Jasauli’s proximity to the Ganges River, though providing a crucial water source, can also influence local weather patterns and, occasionally, contribute to humidity-related issues impacting air quality. The urban–rural gradient around Jasauli is gradual; the town itself represents a small, localized urban center surrounded by a predominantly rural agricultural belt. There are no major industrial zones immediately adjacent to Jasauli, however, larger industrial areas in nearby districts can contribute to regional pollution transport. The flat terrain, typical of the Gangetic Plain, limits natural air dispersion, exacerbating the impact of local emissions. The lack of significant topographical features means that wind patterns are often influenced by broader regional weather systems, making Jasauli susceptible to pollutants originating from distant sources. The soil composition, largely alluvial, also influences dust generation, particularly during drier periods.

Jasauli’s air quality experiences a distinct seasonal cycle heavily influenced by the monsoon and the region’s climate. The monsoon season, typically from June to September, brings relief from the accumulated pollutants, with frequent rainfall washing particulate matter from the atmosphere and strong winds dispersing emissions. However, even during the monsoon, humidity can trap certain pollutants, creating localized pockets of poor air quality. The pre-monsoon period (March-May) is often the most challenging, characterized by high temperatures, low humidity, and stagnant air. This combination frequently leads to temperature inversions, where a layer of warm air traps cooler air near the ground, preventing pollutants from rising and dispersing. Agricultural burning of crop residue after the harvest (October-November) significantly worsens air quality during this period, releasing substantial amounts of particulate matter and gases. Winter months (December-February) are typically foggy, further reducing visibility and trapping pollutants close to the ground. The fog, combined with cooler temperatures and reduced wind speeds, creates conditions conducive to the accumulation of pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and winter months, limiting outdoor activities during peak pollution periods. During the monsoon, while overall air quality improves, those with allergies should be mindful of increased pollen and mold counts. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year, particularly during periods of elevated pollution.