Olhanpur Air Quality Index (AQI)

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Olhanpur, a small town in the Patna district of Bihar, India, sits at coordinates 25.8855°N, 84.8186°E, within the fertile Indo-Gangetic Plain. The landscape is predominantly flat alluvial terrain, a characteristic feature of this region formed by the deposition of sediments from the Ganges and its tributaries. Olhanpur’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. The town is situated approximately 25km southwest of Patna, a major urban and industrial centre, and benefits from agricultural lands surrounding it, primarily rice and wheat cultivation. This proximity to Patna significantly influences Olhanpur’s air quality, as pollutants from the city can be transported downwind. The urban-rural gradient is noticeable, with increasing density and activity closer to Patna. The lack of significant natural barriers like hills or forests exacerbates the impact of regional air pollution. Seasonal flooding from the Ganges and its distributaries is a recurring feature, potentially mobilizing dust and impacting local air quality through increased humidity and mould spore dispersal. The area’s climate is subtropical monsoon, with hot, humid summers and cool, dry winters. The flat terrain and agricultural practices contribute to dust generation, particularly during drier periods. The town’s location within a densely populated agricultural region means biomass burning for land preparation and crop residue disposal is common, adding to particulate matter levels.

Olhanpur experiences a distinct seasonal air quality pattern dictated by the monsoon cycle and agricultural practices. The winter months (November to February) typically see the poorest air quality. Cool temperatures and stagnant air masses create temperature inversions, trapping pollutants near the ground. Biomass burning for warmth and agricultural waste disposal significantly increases particulate matter concentrations. Fog formation further reduces visibility and exacerbates respiratory issues. March and April bring a slight improvement as temperatures rise and winds pick up, but dust storms originating from the west can still impact air quality. The pre-monsoon season (May-June) is characterized by intense heat and dust, leading to elevated ozone levels. The arrival of the monsoon (July-September) offers a period of respite. Heavy rainfall effectively washes away pollutants, and increased humidity suppresses dust. However, high humidity can also promote mould growth. Post-monsoon (October-November) sees a gradual deterioration as temperatures fall, wind speeds decrease, and agricultural burning resumes. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during winter and pre-monsoon periods. Monitoring local weather patterns and avoiding peak pollution times are crucial for protecting health. The monsoon season generally offers the most favourable conditions for outdoor activities.