Rahui Air Quality Index (AQI)

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Rahui, a small town in Bihar, India (25.2728°N, 85.5555°E), is situated within the fertile Indo-Gangetic Plain. The landscape is predominantly flat alluvial terrain, characteristic of the region formed by sediment deposition from the Ganges and its tributaries. Rahui’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. The town is not directly adjacent to a major river, but lies within a network of smaller canals and waterways crucial for irrigation, supporting the surrounding agricultural lands. Bihar, and Rahui specifically, experiences a strong rural-urban gradient; the town is embedded within a largely agricultural matrix, with rice and wheat being dominant crops. This agricultural activity, while vital for the local economy, contributes to seasonal biomass burning, a significant source of particulate matter. Industrial activity in the immediate vicinity of Rahui is limited, but the broader region of Bihar is experiencing increasing industrialisation, particularly around larger cities like Patna. This, coupled with vehicular emissions from increasing road traffic, impacts air quality. The flat topography and frequent temperature inversions, especially during winter, trap pollutants close to the ground, exacerbating air quality issues. The surrounding landscape offers little natural shielding from prevailing winds, meaning pollutants can easily accumulate.

Rahui’s air quality follows a distinct seasonal pattern. The post-monsoon period (October-November) typically sees the worst conditions. The cessation of monsoon rains reduces atmospheric washing, while agricultural stubble burning after the rice harvest releases massive amounts of particulate matter. Shallow temperature inversions are common during these cooler months, trapping pollutants near ground level. December and January continue to be challenging, with cold air and stagnant conditions further concentrating pollutants. The summer months (April-June) bring some relief, as higher temperatures and stronger winds aid in dispersion, though dust storms can temporarily worsen conditions. The monsoon season (July-September) generally offers the cleanest air, as heavy rainfall effectively scrubs the atmosphere. However, increased humidity can also promote the formation of secondary pollutants. For sensitive groups – children, the elderly, and those with respiratory conditions – avoiding outdoor activity during October-November is strongly advised. March-April can also be problematic due to dust. Monitoring local weather patterns and avoiding peak pollution times, typically early mornings and evenings, is crucial. Staying hydrated and using appropriate respiratory protection during poor air quality episodes are recommended.