Bāhāgalpur Air Quality Index (AQI)

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Bāhāgalpur, situated in the Gangetic plains of West Bengal, India, occupies a strategically important position on the southern bank of the Ganges River (Ganga). Its coordinates, 24.5934° N, 87.9536° E, place it within a relatively flat, alluvial terrain characteristic of the Indo-Gangetic Plain. The city’s elevation averages around 25 meters above sea level, contributing to a low dispersion potential for pollutants. The surrounding landscape is predominantly agricultural, with fertile fields stretching as far as the eye can see, supporting intensive rice and jute cultivation. This agricultural activity, while vital for the regional economy, contributes to seasonal biomass burning and fugitive dust emissions. To the north lie the foothills of the Himalayas, influencing regional weather patterns and occasionally trapping pollutants. The proximity to the Ganges is both a blessing and a curse; while providing a crucial water source, it can also act as a conduit for pollutants transported downstream. Bāhāgalpur’s urban-rural gradient is relatively gradual, with smaller towns and villages blending seamlessly into the city’s periphery. Industrial activity is present, though less concentrated than in larger metropolitan areas, primarily focused on food processing, jute mills, and small-scale manufacturing. The lack of significant topographical barriers and the prevalence of agricultural practices combine to create a vulnerability to poor air quality, particularly during specific seasonal periods. The city’s location within a densely populated region further exacerbates these challenges, with increasing urbanisation placing additional strain on air quality management.

Bāhāgalpur’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The dry season, typically spanning from October to May, witnesses a progressive deterioration in air quality. November and December often experience stagnant air conditions and frequent fog, trapping pollutants close to the ground. Agricultural residue burning, a common practice after the harvest season, significantly contributes to particulate matter pollution during these months. January and February are often the most challenging, with temperature inversions frequently occurring, further hindering vertical mixing and concentrating pollutants. The onset of the monsoon season in June brings a temporary reprieve, as rainfall washes away accumulated pollutants and strong winds disperse emissions. July and August generally experience improved air quality, although humidity levels remain high. The post-monsoon transition period, from September to October, sees a gradual return to poorer air quality as wind speeds decrease and agricultural activities resume. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly in November and February. Limiting outdoor exertion during peak pollution episodes and wearing appropriate masks are advisable. The humid conditions during the monsoon can exacerbate respiratory issues for some, necessitating careful monitoring and preventative measures. Maintaining indoor air quality through ventilation and air purification can also provide some relief. Awareness campaigns promoting cleaner agricultural practices and reducing reliance on biomass burning are crucial for long-term air quality improvement.