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Sohtha, Bihar, situated at approximately 25.6449° latitude and 87.3068° longitude, occupies a geographically significant position within the fertile Gangetic plains of eastern India. The city’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain, with minimal elevation changes. This flatness, while conducive to agriculture, unfortunately contributes to air quality challenges as it limits natural dispersion of pollutants. Sohtha lies within a region heavily reliant on agriculture, with surrounding landscapes dominated by rice paddies and other cultivated fields. This agricultural activity, particularly the burning of crop residue after harvest, is a significant contributor to seasonal particulate matter pollution. The city’s proximity to the Ganges River, though providing a vital water source, doesn't significantly influence local air quality due to the prevailing wind patterns and the relatively short distance. Further afield, the region is interwoven with smaller towns and villages, creating a gradual urban–rural gradient. While Sohtha itself is a small settlement, it’s part of a larger network of communities experiencing similar environmental pressures. Industrial activity in the broader Bihar region, concentrated in areas further west and south, can contribute to transboundary pollution events, impacting Sohtha’s air quality. The lack of significant topographical features means that pollutants tend to accumulate, especially during periods of stagnant air, exacerbating local air quality concerns. The flat landscape also limits the effectiveness of natural ventilation, further compounding the issue.

Sohtha’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The pre-monsoon season (March-May) typically witnesses the worst air quality, driven by agricultural practices. Following the harvest of winter crops, farmers often resort to burning crop residue to clear fields quickly, releasing substantial amounts of particulate matter and other pollutants into the atmosphere. This practice, combined with rising temperatures and decreasing wind speeds, leads to atmospheric stagnation and pollutant accumulation. The monsoon season (June-September) brings relief as increased rainfall and stronger winds naturally cleanse the air, significantly improving air quality. However, even during the monsoon, localized pollution from vehicular emissions and domestic sources persists. The post-monsoon season (October-November) sees a gradual return to poorer air quality as temperatures drop and wind speeds decrease, although not as severely as in the pre-monsoon period. The winter months (December-February) are characterized by frequent fog, which traps pollutants near the ground, reducing visibility and further degrading air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and winter months, limiting outdoor activities during peak pollution periods. Maintaining indoor air quality through ventilation and air purifiers is also advisable. The monsoon months generally offer the most favourable conditions for outdoor activities, though vigilance regarding localized pollution sources remains important. Public health advisories are often issued during periods of elevated pollution, urging residents to take preventative measures.