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Katākos, nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 25.3339° N, 87.6715° E, the city’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. The surrounding landscape is dominated by agricultural land, a patchwork of rice paddies and other crops, which, while vital for the regional economy, can contribute to air pollution through seasonal burning practices. Katākos sits within a transitional zone between the densely populated urban centers of Bihar and the more rural, agrarian communities further west. This urban–rural gradient influences the city’s air quality, with agricultural emissions interacting with localized industrial and vehicular sources. While Katākos is not directly adjacent to a major river, its proximity to the Ganges River basin means it experiences the effects of regional weather patterns and moisture levels, which can impact pollutant dispersion. The absence of significant natural barriers, such as hills or mountains, further limits the natural cleansing of the atmosphere, making Katākos susceptible to the accumulation of pollutants originating from both local and distant sources. The relatively small population of 20,304 suggests a primarily rural character, but increasing connectivity and potential for localized industrial activity pose ongoing challenges to air quality management.

Katākos experiences a distinct wet and dry season, profoundly influencing its air quality profile. The dry season, typically spanning from October to May, is characterized by lower rainfall and increased sunshine, leading to drier atmospheric conditions. This often results in increased particulate matter concentrations, particularly during November and December, as agricultural residue burning becomes prevalent in the surrounding fields. Temperature inversions, common during these cooler months, trap pollutants near the ground, exacerbating the problem. The monsoon season, from June to September, brings relief through frequent rainfall, effectively washing away pollutants and significantly improving air quality. However, the onset of the monsoon can initially be accompanied by increased humidity and fog, which can temporarily reduce visibility and trap pollutants. The summer months (April-May) are hot and dry, with stagnant air conditions that can lead to a build-up of pollutants from local sources. During these periods, vulnerable populations, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion, especially during peak daylight hours. The transition periods – the pre-monsoon and post-monsoon months – are particularly challenging, with a combination of agricultural burning and stagnant air. It’s advisable to monitor local air quality reports and take precautions, such as wearing masks, during these times. The interplay of these seasonal factors dictates a fluctuating air quality landscape in Katākos, demanding adaptive strategies for public health protection.