Chatiā Air Quality Index (AQI)

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Chatiā, a small town in the Bihar plains of India, sits at coordinates 26.5396°N, 84.5660°E. Its geography is fundamentally defined by the Gangetic Plain, a vast alluvial tract formed by the Indus and Ganges river systems. The terrain is remarkably flat, with a very gentle slope towards the south, influencing drainage patterns and contributing to localised waterlogging during the monsoon season. Chatiā’s elevation is low, around 78 meters above sea level, making it susceptible to humidity and temperature extremes. The town is not directly adjacent to a major river, but lies within the broader watershed of the Gandak River, impacting local agricultural practices. Surrounding Chatiā is a predominantly agricultural landscape, characterised by intensive farming of rice, wheat, and sugarcane. This agricultural activity, while vital to the local economy, contributes to seasonal biomass burning, a significant source of particulate matter. The urban-rural gradient is sharp; Chatiā is a relatively small settlement embedded within a largely rural hinterland. Limited industrial activity within the town itself means regional pollution sources, transported by prevailing winds, play a crucial role in local air quality. The flat terrain offers little natural dispersion of pollutants, exacerbating air quality issues.

Chatiā experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon periods. The pre-monsoon months (March to May) are typically the worst for air quality. Rising temperatures create stable atmospheric conditions, trapping pollutants from agricultural fires preparing fields for sowing and domestic fuel burning. Dust storms, common in this region, further degrade air quality. The arrival of the monsoon (June to September) brings a temporary respite. Heavy rainfall effectively washes away particulate matter, and increased humidity suppresses dust. However, the monsoon can also lead to localised flooding, increasing mould spore concentrations. Post-monsoon (October to November) sees a resurgence of pollution as temperatures drop and wind speeds decrease, creating temperature inversions that trap pollutants near the ground. This period coincides with the post-harvest burning of crop residue, significantly worsening air quality. Winter (December to February) brings cool, dry conditions and often fog, trapping pollutants and reducing visibility. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the pre-monsoon and post-monsoon seasons. Avoiding peak hours and wearing masks can offer some protection.