Darihat Air Quality Index (AQI)

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Darihat, a small city nestled within the plains of Bihar, India, at coordinates 24.9702°N, 84.2319°E, presents a unique geographic context influencing its air quality. Situated at a relatively low elevation, typical of the Indo-Gangetic Plain, Darihat’s terrain is largely flat, composed of alluvial soil deposited by the Ganges River system. The city’s location is approximately 25km south of the Ganges, a significant factor as riverine environments can trap pollutants during temperature inversions. Darihat is surrounded by intensely cultivated agricultural land, primarily rice and wheat fields, with seasonal burning of crop residue contributing substantially to localised air pollution. While not directly within a major industrial belt, the broader region experiences industrial activity in nearby cities like Bhagalpur, with pollutants potentially transported by prevailing winds. The urban-rural gradient is sharp; Darihat itself is a relatively small urban centre, quickly transitioning to rural agricultural landscapes. This proximity to agricultural practices, combined with the flat topography hindering dispersion, creates conditions conducive to pollutant build-up. Dust from unpaved roads and construction activities further exacerbates particulate matter concentrations, particularly during the drier months. The lack of significant natural barriers to wind flow means Darihat is vulnerable to regional pollution sources.

Darihat’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, is often the most polluted. The receding monsoon leaves behind stagnant air, coupled with increased agricultural burning to prepare fields for the Rabi crop. Temperature inversions become common, trapping pollutants near the ground. December and January bring cooler temperatures and often foggy conditions, further reducing dispersion and increasing particulate matter concentrations. These months are particularly challenging for individuals with respiratory ailments. The pre-monsoon months, March to May, see rising temperatures and dust storms, elevating particulate matter levels. The arrival of the monsoon in June and July brings a temporary respite, as rainfall washes away pollutants and increased humidity aids in settling dust. However, increased humidity can also foster mold growth, impacting indoor air quality. August and September, while still experiencing monsoon conditions, see a gradual return of pollution as agricultural activities resume. For those sensitive to air pollution, avoiding outdoor activity during October-November and March-May is advisable. Staying indoors during peak pollution hours and using air purifiers are recommended protective measures.