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Koili Simra, nestled within the plains of Bihar, India, at coordinates 25.4714°N, 87.2175°E, presents a unique geographic context influencing its air quality. The city’s terrain is largely flat, characteristic of the Indo-Gangetic Plain, with an elevation hovering around 45 meters above sea level. This flatness contributes to limited natural dispersion of pollutants. Situated within the Muzaffarpur district, Koili Simra is surrounded by intensely cultivated agricultural land, primarily rice and sugarcane, with increasing mechanisation contributing to dust and localised emissions. The Burhi Gandak river flows relatively close, but its influence on immediate air quality is limited due to prevailing wind patterns. The urban-rural gradient is sharp; the city itself is relatively small with a population of 23,480, quickly transitioning to rural farmland. This proximity to agricultural practices, including seasonal crop residue burning, is a significant factor. Furthermore, the region isn’t a major industrial hub, but smaller brick kilns and local industries contribute to particulate matter. The city’s location within the Indo-Gangetic Plain also means it’s susceptible to stagnant air masses, particularly during winter, trapping pollutants. The lack of significant topographical features hinders natural ventilation, exacerbating air quality challenges.

Koili Simra experiences a distinct seasonal air quality narrative dictated by the monsoon and post-monsoon periods. The summer months (April-June) bring high temperatures and dry conditions, leading to increased dust suspension from agricultural activities and unpaved roads. However, winds can offer some respite. The monsoon season (July-September) generally improves air quality through rainfall, washing away particulate matter. However, increased humidity can also foster mold growth, impacting respiratory health. Post-monsoon (October-November) is often the worst period. Cooler temperatures create temperature inversions, trapping pollutants near the ground, combined with widespread crop residue burning after the harvest. This period sees a significant deterioration in air quality. Winter (December-February) continues the trend of poor air quality due to stagnant air, temperature inversions, and increased reliance on biomass burning for heating. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during October-February. March offers a gradual improvement as temperatures rise and winds pick up. Avoiding outdoor exertion during peak pollution times, particularly mornings and evenings in the post-monsoon and winter months, is advisable.