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Panhar, nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 25.0936° N, 85.2176° E, the city’s terrain is predominantly flat, characteristic of the Indo-Gangetic alluvial plain. Its elevation is relatively low, contributing to atmospheric stability and potential for pollutant accumulation. The surrounding landscape is dominated by agricultural fields – rice and wheat cultivation are prevalent – interspersed with small villages and scattered groves of trees. This proximity to intensive agricultural zones introduces a significant source of particulate matter, particularly during harvest seasons when crop residue burning is common. Panhar’s location within Bihar places it within a region experiencing rapid urbanization and industrial development, although the immediate vicinity remains largely rural. The urban–rural gradient is gradual, with agricultural land transitioning into residential areas and small-scale industries. While Panhar itself is a small settlement, its regional position means it is influenced by air pollution originating from larger urban centers further west and north, carried by prevailing winds. The absence of significant natural barriers, such as hills or mountains, allows pollutants to spread relatively unimpeded across the plains. The Gangetic River, though not immediately adjacent, exerts a regional influence on climate and atmospheric conditions, potentially impacting humidity and wind patterns, which in turn affect pollutant dispersion. The flat topography and agricultural surroundings combine to create a setting where air quality is particularly vulnerable to human activities.

Panhar’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The dry season, typically spanning from October to May, witnesses a marked deterioration in air quality. During these months, lower temperatures and reduced wind speeds contribute to atmospheric stability, fostering temperature inversions – a phenomenon where a layer of warm air traps cooler air near the ground, preventing pollutants from dispersing. Crop residue burning, a widespread practice after the harvest of rice and wheat, significantly elevates particulate matter concentrations during November and December. The winter months (December-February) are often characterized by dense fog, further exacerbating the problem by trapping pollutants and reducing visibility. The monsoon season, from June to September, brings relief as increased rainfall and stronger winds effectively flush out pollutants. However, even during the monsoon, localized pollution from construction activities and vehicular emissions can still occur. The transitional periods – spring (March-April) and autumn (September-October) – experience fluctuating air quality, influenced by changing wind patterns and the gradual shift in temperature. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during peak pollution periods in November and December. Limiting outdoor activities during foggy days and avoiding areas with high traffic density are advisable. Maintaining indoor air quality through ventilation and air purifiers can also provide some protection.