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Daudnagar, nestled in the plains of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 25.03°N, 84.40°E, the town sits at a relatively low elevation, around 118 meters (387 feet) above sea level. This low elevation, combined with the flat terrain characteristic of the Indo-Gangetic Plain, contributes to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. The surrounding landscape is predominantly agricultural, with vast stretches of farmland dedicated to crops like rice, maize, and pulses. This agricultural activity, while vital to the regional economy, introduces sources of air pollution through the burning of crop residue after harvest – a common practice that significantly impacts air quality. Daudnagar’s proximity to the larger industrial belt of Bihar, though not immediately adjacent, means it can be affected by pollutants transported by prevailing winds. The urban–rural gradient around Daudnagar is gradual, with smaller villages and agricultural fields transitioning seamlessly into the town’s built environment. The lack of significant natural barriers, such as hills or mountains, further limits the dispersion of pollutants. The nearby rivers, though providing a water source, do not significantly influence local air quality due to the prevailing wind patterns and the scale of the river systems relative to the town’s size. The flat topography and agricultural surroundings create a unique challenge for air quality management, requiring targeted strategies to mitigate localized and regional pollution sources.

Daudnagar’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The dry season, typically spanning from October to May, presents the most significant air quality challenges. During these months, lower humidity and reduced rainfall contribute to the formation of temperature inversions, trapping pollutants close to the ground. Agricultural burning, prevalent immediately after the harvest season (October-November), exacerbates this issue, releasing substantial quantities of particulate matter and other harmful gases. The winter months (December-January) often experience dense fog, further hindering pollutant dispersion and intensifying the impact of existing emissions. Conversely, the monsoon season (June-September) brings relief, with frequent rainfall washing away pollutants and strong winds dispersing them. However, even during the monsoon, localized pollution from construction activities and vehicular emissions can still occur. The pre-monsoon period (April-May) can be problematic, characterized by hot, dry conditions and increased dust levels. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning and fog. Outdoor activities are generally best avoided during the early morning hours in winter and during peak agricultural burning periods. Maintaining indoor air quality through ventilation and air purifiers can also provide some protection. The transition periods between seasons often see fluctuating air quality, requiring vigilance and awareness of local conditions.