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Dharphari, a small town in Bihar, India (26.1501°N, 84.9564°E), is situated within the Indo-Gangetic Plain, a vast and fertile region. The terrain is predominantly flat, characteristic of alluvial plains formed by the deposition of sediments from the Ganges and its tributaries. This flatness contributes to limited natural air dispersion. Dharphari’s elevation is relatively low, increasing susceptibility to temperature inversions, a key factor in trapping pollutants. The town is not directly adjacent to a major river, but lies within a network of smaller canals and waterways crucial for irrigation, supporting the surrounding agricultural lands. Bihar is heavily reliant on agriculture, and Dharphari is likely surrounded by farmland, with potential for seasonal crop residue burning contributing to localised air pollution. The urban-rural gradient is pronounced; Dharphari represents a smaller urban centre embedded within a largely rural landscape. Industrial activity in the immediate vicinity is likely limited, but regional industrial belts further afield can contribute to background pollution levels transported by prevailing winds. The lack of significant topographical features hinders the flushing out of pollutants, making Dharphari vulnerable to air quality issues, particularly during calmer weather conditions. The surrounding landscape offers little in the way of natural air filtration.

Dharphari’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, often sees the worst conditions. The cessation of monsoon rains removes the natural cleansing effect of rainfall, while cooler temperatures and calm winds promote temperature inversions, trapping pollutants near the ground. This coincides with increased agricultural burning as farmers clear fields after the harvest. Winter, from December to February, maintains poor air quality due to continued temperature inversions and the use of solid fuels for heating. The pre-monsoon months, March to May, bring rising temperatures and dust storms, increasing particulate matter concentrations. The monsoon season, from June to September, offers a temporary respite. Heavy rainfall effectively washes pollutants from the air, leading to improved air quality. However, increased humidity can also promote the formation of secondary pollutants. For those with respiratory conditions, avoiding outdoor activity during October-November and March-May is advisable. Children and the elderly should exercise caution throughout the year, particularly during periods of calm weather. Monitoring local conditions and limiting strenuous activity on poor air quality days is crucial for protecting health.