Loading air quality context...

Sukhāsan, nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 25.4944° N, 87.5263° E, the city’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain, with an elevation of roughly 55 meters above sea level. This low-lying topography contributes to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. Sukhāsan’s regional setting is defined by its proximity to the Ganges River, although the river’s direct influence on the city’s immediate microclimate is limited due to distance and intervening agricultural land. The surrounding landscape is overwhelmingly rural, dominated by agricultural fields – primarily rice and wheat cultivation – which, while vital for the regional economy, can contribute to seasonal particulate matter pollution from crop residue burning. The urban–rural gradient transitions rapidly, with Sukhāsan representing a small, localized urban center surrounded by a dense agricultural matrix. There are no major industrial belts immediately adjacent to Sukhāsan, however, larger industrial areas in nearby districts can influence regional air quality patterns. The flat terrain and limited natural barriers exacerbate the impact of regional pollution sources, making Sukhāsan susceptible to transboundary air pollution events. The lack of significant elevation changes also means that wind dispersal is often limited, further contributing to pollutant persistence. The soil composition, largely alluvial, also influences dust generation, particularly during drier periods.

Sukhāsan’s air quality follows a distinct seasonal pattern dictated by the region’s monsoonal climate. The monsoon season, typically spanning from June to September, brings relief from accumulated pollutants as consistent rainfall and strong winds effectively flush the atmosphere. Humidity levels are high, and temperatures moderate, offering a respite from the drier, more polluted months. However, the post-monsoon period (October-November) presents a significant challenge. Following the monsoon’s retreat, agricultural practices involving crop residue burning become widespread across the surrounding plains. This practice releases substantial quantities of particulate matter, significantly degrading air quality. Fog, a common occurrence during these months, traps pollutants near the ground, exacerbating the problem. The winter months (December-February) are generally characterized by cooler temperatures and frequent temperature inversions, where a layer of warm air sits above cooler air near the surface, preventing vertical mixing and trapping pollutants. Spring (March-May) sees a gradual improvement as temperatures rise, and winds increase, dispersing pollutants. However, dust storms originating from the Thar Desert can occasionally impact Sukhāsan during this period. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the post-monsoon and winter months, limiting outdoor activity during peak pollution periods. Maintaining indoor air quality through ventilation and air purification can also be beneficial. The humid monsoon season is generally the most favourable time for outdoor activities, though pollen allergies should be considered.