Pursa Air Quality Index (AQI)

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Pursa, a small city nestled within the plains of Bihar, India, at coordinates 26.3019°N, 86.4778°E, presents a unique geographic context influencing its air quality. The city’s terrain is largely flat, characteristic of the Indo-Gangetic Plain, with an elevation hovering around 50 meters above sea level. This flatness contributes to limited natural dispersion of pollutants. Pursa is situated within a predominantly agricultural zone, heavily reliant on farming practices, including seasonal crop residue burning – a significant contributor to localised air pollution. The surrounding landscape is dominated by cultivated fields, interspersed with small rural settlements. The proximity to the Gandak River, while providing a water source, also creates conditions conducive to temperature inversions, trapping pollutants during cooler months. The urban-rural gradient is relatively sharp; Pursa itself is a small urban centre, quickly transitioning to agricultural land. Industrial activity is limited within Pursa itself, but regional industrial belts further afield can contribute to background pollution levels. The city’s location within the densely populated Bihar state exacerbates the issue, as regional pollution transport is common. Understanding these geographical factors is crucial for addressing Pursa’s air quality challenges.

Pursa experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon periods. The monsoon season (June-September) generally brings temporary relief, as rainfall washes away particulate matter and increased humidity suppresses dust. However, high humidity can also foster mould growth, impacting respiratory health. October-November sees a significant deterioration in air quality, coinciding with the post-monsoon period and widespread agricultural burning of crop residue following the rice harvest. This practice releases massive amounts of particulate matter, smoke, and other pollutants. Winter (December-February) is characterised by stagnant air masses and frequent temperature inversions, trapping pollutants near the ground, leading to consistently poor air quality. Fog further exacerbates the situation, reducing visibility and increasing pollutant concentrations. March-May brings rising temperatures and dry conditions, leading to increased dust and potential for localised fires. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during October-February. The best time for outdoor activities is generally during the monsoon season, though mould allergies should be considered.