Patālia, a small city nestled within the state of Bihar, India, occupies a relatively flat expanse of the Indo-Gangetic Plain at approximately 25.6600°N, 86.0066°E. Its elevation, typical of the region, is low-lying, contributing to limited natural air dispersion. The city’s geography is dominated by alluvial soil, a legacy of the Ganges River’s historical course, which flows relatively close by, influencing local humidity and temperature. Patālia is surrounded by intensely cultivated agricultural land, primarily rice and wheat paddies, a significant source of seasonal biomass burning. While not a major industrial hub itself, Patālia functions as a market town for surrounding agricultural areas and experiences increased vehicular traffic from the transport of produce. The urban-rural gradient is sharp; the city core quickly transitions to farmland. This proximity to agricultural practices, combined with the flat terrain and limited wind corridors, creates conditions conducive to pollutant accumulation. Dust from agricultural activities and unpaved roads further exacerbates particulate matter concentrations. The lack of significant topographical features hinders the flushing out of pollutants, making Patālia particularly vulnerable to air quality issues, especially during periods of meteorological stagnation. The regional climate, characterised by hot summers and cool winters, also plays a crucial role in pollution dynamics.

Patālia’s air quality follows a distinct seasonal pattern. October to February represents the most challenging period. Cooler temperatures lead to temperature inversions, trapping pollutants near the ground. Reduced wind speeds during these months further limit dispersion. The burning of crop residue after the Kharif harvest in November contributes significantly to particulate matter spikes. March and April bring warmer temperatures and some wind, offering temporary relief, but dust storms are common, elevating PM10 levels. The pre-monsoon months of May and June are intensely hot and dry, with increased dust and potential for localised fires. The arrival of the monsoon in July and August brings a dramatic improvement in air quality. Rainfall effectively washes away pollutants, and increased humidity suppresses dust. However, high humidity can also foster mold growth, impacting respiratory health. September sees a gradual decline in air quality as the monsoon weakens. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during October-February. March-April requires caution due to dust. The monsoon months offer the most favourable conditions for outdoor activities. Monitoring local weather patterns is crucial for informed decision-making.