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Patpāra, nestled in the fertile plains of Bihar, India, occupies a geographically significant position within the Gangetic Basin. Located at approximately 26.4328° N latitude and 86.1916° E longitude, the city’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain. Its elevation is relatively low, contributing to atmospheric stability and potential for pollutant accumulation. Patpāra sits within a region heavily influenced by the monsoon climate, with the Ganges River flowing nearby, though not directly adjacent to the urban area. This proximity to a major river system impacts local humidity and can influence wind patterns, though the effect on air quality is complex. The surrounding landscape is a mosaic of agricultural fields – primarily rice and wheat cultivation – interspersed with small villages and scattered rural settlements. This creates a distinct urban–rural gradient, with agricultural activities contributing to seasonal particulate matter emissions, particularly during harvest periods when burning of crop residue is common. Further afield, the Chota Nagpur Plateau lies to the south, influencing regional weather systems. The city’s location within a densely populated state, coupled with its proximity to industrial zones in surrounding districts, means it is susceptible to transboundary pollution. The relatively flat topography and limited natural barriers exacerbate the issue, allowing pollutants to spread easily across the region. The lack of significant elevation changes hinders atmospheric dispersion, potentially leading to stagnant air conditions and increased concentrations of airborne contaminants.

Patpāra’s air quality follows a distinct seasonal pattern dictated by its monsoon-influenced climate. The pre-monsoon season (March-May) typically witnesses the poorest air quality. Rising temperatures and decreasing wind speeds create conditions conducive to temperature inversions, trapping pollutants near the ground. Agricultural burning, a widespread practice to clear fields for the planting season, significantly contributes to particulate matter pollution during this period. The monsoon season (June-September) brings relief, with increased rainfall and stronger winds dispersing pollutants. However, heavy rainfall can also lead to increased humidity and the formation of secondary pollutants. The post-monsoon season (October-November) sees a return to poorer air quality as temperatures drop and wind speeds decrease again, mirroring the pre-monsoon conditions, but often with lingering agricultural smoke. Winter months (December-February) are generally characterized by colder temperatures and frequent fog, which further restricts atmospheric mixing and traps pollutants, particularly during periods of calm weather. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, limiting outdoor activities during peak pollution episodes. During the foggy winter months, it’s advisable to wear masks and avoid strenuous outdoor exertion. The monsoon season offers the most favourable conditions for outdoor activity, though vigilance regarding humidity-related health concerns remains important. Understanding these seasonal variations is crucial for managing air quality risks and protecting public health.