Sarso Air Quality Index (AQI)

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Sarso, a small town in the Bihar plains of India (26.2333°N, 86.1768°E), occupies a low-lying position within the Gangetic alluvium. The terrain is remarkably flat, characteristic of the Indo-Gangetic Plain, with an elevation hovering around 50-60 meters above sea level. This flatness contributes to limited natural dispersion of pollutants. Sarso is situated within a predominantly agricultural landscape, heavily reliant on rice and wheat cultivation, with increasing mechanisation. The town’s air quality is significantly influenced by its proximity to larger urban centres like Patna, approximately 90km to the east, and Muzaffarpur, roughly 60km to the north. These cities act as regional pollution sources, with prevailing winds often carrying emissions towards Sarso. The Burhi Gandak river flows nearby, but its influence on local air quality is more related to humidity and potential for localised fog formation than direct pollutant removal. The urban-rural gradient is sharp; Sarso itself is a relatively small settlement, but surrounding villages contribute to localised biomass burning, particularly during agricultural residue disposal. Dust from unpaved roads and construction activities also adds to particulate matter concentrations. The lack of significant topographical features hinders the flushing out of pollutants, creating a bowl-like effect that traps airborne contaminants.

Sarso experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon cycles. The monsoon season (June-September) generally brings temporary relief, as rainfall washes away particulate matter and increased humidity suppresses dust. However, high humidity can also foster mould growth, impacting respiratory health. October-November sees a deterioration in air quality as the monsoon retreats, and agricultural burning of rice stubble intensifies, releasing significant amounts of smoke and pollutants. This period is particularly challenging for those with respiratory conditions. Winter (December-February) brings cooler temperatures and frequent temperature inversions, trapping pollutants near the ground, leading to stagnant, hazy conditions. Fog formation further exacerbates the problem, reducing visibility and increasing particulate matter concentrations. March-May is characterised by rising temperatures and dry winds, stirring up dust from agricultural fields and construction sites. This period sees a gradual increase in pollution levels, peaking before the arrival of the monsoon. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular conditions – should limit outdoor activity during the post-monsoon and winter months, and consider using air purifiers indoors.