Mohanpur Air Quality Index (AQI)

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Mohanpur, a small city nestled within the state of Bihar, India, occupies a relatively flat alluvial plain at approximately 25.5620°N latitude and 85.5917°E longitude. Its elevation, typical of the Gangetic plains, is low, contributing to limited atmospheric dispersion of pollutants. The city’s geography is profoundly shaped by the Ganges River, which flows nearby, influencing local humidity and occasionally contributing to stagnant air conditions. Mohanpur is surrounded by intensely cultivated agricultural land, primarily rice and wheat fields, with seasonal crop residue burning being a significant factor. While not a major industrial hub itself, Mohanpur’s proximity to larger industrial areas within Bihar and neighboring states means it can experience transboundary pollution. The urban-rural gradient is sharp; the city core is densely populated, transitioning quickly to agricultural fields. This proximity to agricultural practices, combined with the flat terrain and limited wind corridors, creates a challenging environment for maintaining good air quality. Dust from unpaved roads and construction activities further exacerbates the situation. The local climate is subtropical monsoon, with distinct wet and dry seasons, impacting pollutant concentrations differently throughout the year. The lack of significant topographical features hinders natural ventilation, trapping pollutants near ground level.

Mohanpur’s air quality follows a distinct seasonal pattern dictated by the monsoon and post-monsoon climate. The monsoon season (June-September) generally brings temporary relief, as rainfall washes away particulate matter and increased humidity suppresses dust. However, high humidity can also trap pollutants closer to the ground. October-November sees a deterioration in air quality as the monsoon retreats, and agricultural burning of crop residue intensifies following the harvest. This period is often characterized by stagnant air and temperature inversions, trapping smoke and pollutants. Winter (December-February) is typically the worst period, with consistently poor air quality due to low wind speeds, temperature inversions, and continued burning of biomass for heating and cooking. Fog further exacerbates the problem, reducing visibility and trapping pollutants. March-May sees a gradual improvement as temperatures rise and winds pick up, though dust storms are common. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during October-February. The best time for outdoor activities is generally July-September, during the peak of the monsoon, but even then, caution is advised due to potential humidity-related issues.