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Gaura, situated in the state of Bihar, India, at coordinates 25.4961°N, 85.9709°E, is a small city deeply embedded within the fertile Gangetic plains. The terrain is predominantly flat, characteristic of alluvial deposits from the Ganges River, which flows relatively close by, influencing local humidity and contributing to the region’s agricultural productivity. With a population of approximately 70,081, Gaura exhibits a typical urban-rural gradient, transitioning from denser settlements towards surrounding agricultural lands dominated by rice and wheat cultivation. This agricultural activity, while vital to the local economy, introduces potential sources of particulate matter through crop residue burning and fertilizer use. The city’s location within the Indo-Gangetic Plain also means it’s susceptible to stagnant air masses, particularly during winter months, trapping pollutants. While not directly within a major industrial belt, regional industrial activity in nearby areas like Patna contributes to background pollution levels. The lack of significant topographical features – hills or large forests – limits natural dispersion of pollutants. The surrounding landscape is largely comprised of farmland, small villages, and seasonal water bodies, creating a microclimate prone to localised humidity and temperature fluctuations, impacting pollutant behaviour. Understanding this geographical context is crucial for addressing Gaura’s air quality challenges.

Gaura experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon cycles. The monsoon season (June-September) generally brings temporary relief from pollution due to rainfall washing away particulate matter and increased wind speeds dispersing pollutants. However, high humidity can also foster mould growth, impacting respiratory health. October-November sees a deterioration in air quality as the monsoon retreats, and temperatures drop, leading to temperature inversions that trap pollutants near the ground. This period coincides with post-harvest crop residue burning, significantly increasing particulate matter concentrations. Winter (December-February) is typically the worst period for air quality, with stagnant air, low temperatures, and continued burning practices exacerbating pollution. Fog formation further reduces visibility and traps pollutants. March-May sees a gradual improvement as temperatures rise and wind speeds increase, though dust storms are common, contributing to particulate matter. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during October-February. Monitoring local weather patterns and avoiding peak pollution times is advisable. The post-monsoon and winter months demand heightened vigilance regarding respiratory health.