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Ninga, a small town nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 25.4616° N latitude and 86.0757° E longitude, the town’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. Ninga is surrounded by a landscape dominated by agricultural fields – primarily rice and wheat cultivation – which, while vital for the regional economy, can contribute to particulate matter pollution through seasonal burning practices. The town’s proximity to the Ganges River, though providing a crucial water source, also influences local weather patterns and can, under certain conditions, trap pollutants. The urban–rural gradient around Ninga is gradual; the town itself is relatively small, transitioning quickly into agricultural land. There are no major industrial belts immediately adjacent to Ninga, however, larger industrial areas in nearby cities like Patna can influence regional air quality. The flat, expansive landscape offers limited natural barriers to pollutant dispersal, and the prevailing wind patterns, often influenced by the monsoon system, play a crucial role in determining the movement and concentration of airborne contaminants. The lack of significant elevation changes means that temperature inversions, a common phenomenon in the region, can readily occur, trapping pollutants close to the ground.

Ninga’s air quality experiences a distinct seasonal cycle heavily influenced by the monsoon and associated weather patterns. The pre-monsoon season (March-May) typically witnesses the poorest air quality. Rising temperatures and decreasing humidity create stable atmospheric conditions, often leading to temperature inversions that trap pollutants. Agricultural burning, a common practice to clear fields for the planting season, significantly contributes to particulate matter pollution during this period. The monsoon season (June-September) brings relief, with increased rainfall and stronger winds dispersing pollutants. However, heavy rainfall can also lead to increased humidity and stagnant air conditions in certain instances. The post-monsoon season (October-November) sees a return to more stable conditions, with cooler temperatures and occasional fog, which further exacerbates pollution. December and January are generally the coldest months, with frequent fog episodes that severely restrict visibility and trap pollutants near 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 activities during peak pollution hours (typically early morning and late evening). During the foggy winter months, it is advisable to wear masks and avoid strenuous outdoor exertion. The monsoon season offers a window of relatively cleaner air, but vigilance is still necessary, particularly during periods of prolonged rainfall or stagnant weather. Maintaining indoor air quality through ventilation and air purification can also be beneficial, especially during periods of elevated pollution.