Koskāpur Air Quality Index (AQI)

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Koskāpur, nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 26.0216° N, 87.2279° 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. Koskāpur’s location within Bihar places it within a region experiencing rapid urbanization and industrial development, although the city itself remains relatively small. The urban–rural gradient is gradual, with agricultural land extending almost to the city limits. While Koskāpur lacks immediate proximity to major rivers, the region is influenced by the monsoon system, bringing seasonal rainfall that can temporarily flush pollutants from the atmosphere. The lack of significant topographic features, combined with the flat terrain and agricultural activity, creates conditions that can exacerbate air quality challenges, particularly when meteorological conditions are unfavourable for pollutant dispersion. The prevailing wind patterns, often light and variable, further contribute to this issue, hindering the natural cleansing of the atmosphere. The regional industrial belt, located further west, can also contribute to transboundary pollution events.

Koskāpur’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The dry season, typically spanning from October to May, presents the most significant air quality concerns. During these months, lower temperatures and reduced wind speeds frequently lead to temperature inversions, trapping pollutants near the ground. Agricultural burning, a widespread practice for clearing fields after the harvest, dramatically increases particulate matter concentrations, especially in November and December. The winter months (December-February) are often characterized by dense fog, further reducing visibility and hindering pollutant dispersion. The monsoon season, from June to September, brings a period of relative relief. The increased rainfall effectively washes pollutants from the atmosphere, and stronger winds help to disperse remaining contaminants. However, the onset of the monsoon can initially be accompanied by increased humidity and a temporary rise in ozone levels due to increased solar radiation. Spring (March-May) sees a gradual increase in temperatures and a slight improvement in air quality compared to the peak winter months, but agricultural activities begin to ramp up, leading to a slow increase in particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning and fog. Outdoor activities are best avoided during peak pollution episodes, and the use of air purifiers and masks is recommended. The monsoon months offer a window of improved air quality, making them a more favourable time for outdoor pursuits.