Bhandārso Air Quality Index (AQI)

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Bhandārso, nestled in the Sheohar district of Bihar, India (26.1780° N, 86.1415° E), occupies a geographically significant position within the fertile Gangetic plains. The city’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain, with an average elevation of approximately 128 meters above sea level. This low-lying topography, while conducive to agriculture, presents challenges regarding air quality dispersion. Bhandārso is surrounded by a landscape dominated by agricultural fields – primarily rice and maize cultivation – which contribute to seasonal biomass burning and dust generation. The proximity to the Koshi River, though providing a vital water source, can also lead to increased humidity, potentially trapping pollutants under certain atmospheric conditions. The urban–rural gradient around Bhandārso is relatively gradual; the city itself is a small, developing urban centre, transitioning quickly into agricultural land. There are no major industrial belts immediately adjacent to Bhandārso, however, larger industrial areas in surrounding districts can influence regional air quality patterns. The prevailing winds, often influenced by the monsoon system, play a crucial role in transporting pollutants from distant sources. The flat terrain limits vertical mixing, particularly during periods of temperature inversion, exacerbating local pollution concentrations. The lack of significant natural barriers further contributes to the vulnerability of Bhandārso to external air pollution sources, making it susceptible to transboundary pollution events originating from the densely populated Indo-Gangetic Plain.

Bhandārso’s air quality experiences a distinct seasonal cycle heavily influenced by the monsoon and agricultural practices. The pre-monsoon season (March-May) typically witnesses a significant deterioration in air quality. Rising temperatures and decreasing rainfall create stable atmospheric conditions, often leading to temperature inversions that trap pollutants near the ground. Agricultural residue burning, a common practice after the harvest of rice and maize, releases substantial quantities of particulate matter and other harmful gases, dramatically increasing pollution levels. The monsoon season (June-September) brings relief, with frequent rainfall and stronger winds dispersing pollutants. Humidity increases, which can sometimes exacerbate respiratory issues for sensitive individuals. The post-monsoon season (October-November) sees a return to drier conditions and a resurgence of agricultural burning, again leading to elevated pollution. Winter months (December-February) are often characterized by fog, which further restricts air movement and traps pollutants, creating stagnant air conditions. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, limiting outdoor activities during peak pollution periods. During the winter months, prolonged exposure to fog-laden air can be particularly detrimental. Maintaining indoor air quality through ventilation and air purification can offer some protection. Public health advisories regarding agricultural burning should be closely monitored and heeded.