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Nawada, situated in the southern part of Bihar, India, occupies a strategic position within the Gangetic Plain, approximately 100 kilometres southwest of the state capital Patna. The city lies at an elevation of around 80 metres above sea level, nestled in a relatively flat terrain characteristic of the Indo-Gangetic basin, which profoundly influences its air quality dynamics. Nawada's urban character blends modest urban development with strong rural linkages, creating an urban–rural gradient where pollution sources from both spheres converge. The surrounding landscape is predominantly agricultural, with extensive rice and wheat cultivation, interspersed with scattered brick kilns that dot the periphery. Proximity to the Phalgu River, a seasonal tributary of the Ganges, provides some hydrological context but offers limited mitigation against air pollution due to its intermittent flow. The city's location in the heart of the Indo-Gangetic Plain, a notorious pollution hotspot, subjects it to regional aerosol transport, especially during winter when calm winds and temperature inversions trap pollutants. This geographic setting, combined with local emissions from domestic biomass burning, vehicle exhaust, and road dust, creates a compounded air quality challenge, exacerbated by the basin's topography that restricts pollutant dispersion.

Nawada's air quality follows a distinct seasonal rhythm shaped by its humid subtropical climate and local emission patterns. During winter (October to January), pollution peaks dramatically due to a confluence of factors: agricultural burning post-harvest, increased domestic biomass burning for heating, and meteorological conditions like temperature inversions and dense fog that trap pollutants near the surface. This period poses severe health risks, especially for sensitive groups such as children, the elderly, and those with respiratory conditions, who should limit outdoor activities and use air purifiers indoors. Spring (February to March) sees gradual improvement as temperatures rise and winds pick up, though occasional dust storms can cause temporary spikes. The summer monsoon (June to September) brings the cleanest air, as heavy rains wash away pollutants and strong winds aid dispersion, making it the most favourable season for outdoor activities. However, extreme heat and flooding hazards require caution. Post-monsoon (October onwards) marks a rapid deterioration as burning resumes and weather conditions stabilise, leading back into the hazardous winter phase. Residents should monitor local air quality indices and plan activities accordingly, with winter being the least advisable for prolonged exposure.