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Sitalpur, a small town in Bihar, India, situated at approximately 26.4050°N latitude and 85.0070°E longitude, occupies a relatively flat section of the Indo-Gangetic Plain. The terrain is predominantly alluvial, formed by the deposition of sediments from the Ganges River and its tributaries. This flat landscape, while fertile for agriculture, hinders natural dispersion of pollutants. Sitalpur’s elevation is low, typically under 70 meters above sea level, further exacerbating this issue. The town is located within a predominantly rural agricultural zone, with rice paddies and wheat fields dominating the surrounding landscape. While not directly on the Ganges, the river’s influence on the regional climate and humidity is significant. The urban-rural gradient is sharp; Sitalpur represents a concentrated pocket of settlement within a largely agrarian setting. Increasing mechanisation of agriculture, alongside localised brick kilns and small-scale industries, contribute to particulate matter emissions. The lack of substantial green buffers and prevailing wind patterns, often calm during certain periods, mean pollutants can accumulate, impacting local air quality. The town’s position within the densely populated Bihar plain means it’s susceptible to regional pollution transport from larger urban centres.

Sitalpur experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon climate. The pre-monsoon months of April and May are typically the worst for air quality. Rising temperatures create strong convective currents, but also trap pollutants under temperature inversions, particularly in the mornings. Dust from agricultural activities and road construction adds to particulate matter levels. The arrival of the monsoon in June-September brings a temporary respite. Heavy rainfall effectively washes away pollutants, and increased humidity suppresses dust. However, increased cloud cover can also contribute to localised temperature inversions. Post-monsoon, from October to November, sees a resurgence of pollution as temperatures cool and wind speeds decrease, trapping emissions from crop residue burning and Diwali celebrations. Winter, December to February, is characterised by fog and stagnant air, leading to significant particulate matter accumulation. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during April-May and October-February. Avoiding peak traffic hours and using masks when outdoors are recommended precautions throughout the year.