Sākhmohan Air Quality Index (AQI)

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Sākhmohan, a small town in Bihar, India, sits at coordinates 25.6325°N, 85.9859°E, within the fertile Gangetic plains. 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. The town’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. Sākhmohan is situated within a largely agricultural zone, with rice paddies and wheat fields dominating the surrounding areas. This agricultural activity, while vital to the local economy, introduces sources of particulate matter through crop residue burning and fertilizer use. The proximity to the Ganges River, while providing a water source, can also contribute to humidity and potential temperature inversions, trapping pollutants near the ground. The urban-rural gradient is quite sharp; Sākhmohan is a relatively small settlement surrounded by rural farmland. Industrial activity is limited within the town itself, but regional industrial belts further east and west can contribute to long-range transport of pollutants. The town’s location within the Indo-Gangetic Plain, a known hotspot for air pollution, exacerbates these challenges. The lack of significant topographical features hinders natural ventilation, making Sākhmohan particularly vulnerable to air quality issues.

Sākhmohan experiences a distinct seasonal air quality pattern. The post-monsoon period, from October to November, typically sees the worst air quality. The cessation of monsoon rains reduces atmospheric cleansing, while stubble burning from surrounding agricultural lands releases massive amounts of particulate matter. Shallow temperature inversions are common during these cooler months, trapping pollutants close to the ground. December and January bring cooler temperatures and often foggy conditions, further exacerbating particulate matter concentrations. The winter months are therefore best avoided for strenuous outdoor activity, particularly for those with respiratory conditions. As spring arrives in February and March, temperatures begin to rise, and wind speeds increase, leading to some improvement. The pre-monsoon season (April-June) is characterized by hot, dry winds which can stir up dust and contribute to higher ozone levels. The monsoon season (July-September) generally offers the cleanest air, as rainfall washes away pollutants and increased humidity suppresses dust. However, increased humidity can also promote the formation of secondary pollutants. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular illnesses – should exercise caution during the post-monsoon and winter months.