Kāndi Air Quality Index (AQI)

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Kāndi, nestled in the Purba Bardhaman district of West Bengal, India, occupies a geographically significant position within the Ganges Delta region. Located at approximately 23.95°N, 88.03°E, the city’s terrain is predominantly flat, characteristic of the fertile alluvial plains formed by the Hooghly River, a major distributary of the Ganges. The surrounding landscape is a mosaic of agricultural fields – primarily rice paddies and jute cultivation – interspersed with small villages and scattered groves of mango and palm trees. This intensive agricultural activity, while vital to the regional economy, contributes to seasonal particulate matter emissions from crop burning. Kāndi’s proximity to the Hooghly River moderates temperatures to some extent, but also introduces humidity, which can trap pollutants under certain atmospheric conditions. The urban–rural gradient around Kāndi is gradual; the city itself is relatively small, with a population of 55,632, transitioning seamlessly into the surrounding agricultural landscape. Further afield, the industrial belt around Durgapur, approximately 80km to the west, represents a potential source of long-range transported pollutants. The elevation is low, generally below 20 meters above sea level, which limits atmospheric dispersion and can exacerbate ground-level pollution. The flat topography and prevailing wind patterns often lead to stagnant air conditions, particularly during cooler months, hindering the natural cleansing of the atmosphere. The city’s location within a densely populated deltaic plain makes it vulnerable to the impacts of regional pollution trends.

Kāndi’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The monsoon season, typically spanning June to September, brings relief from accumulated pollutants as heavy rainfall washes away particulate matter and strong winds disperse emissions. However, the preceding pre-monsoon months (March-May) often witness a significant deterioration in air quality. Rising temperatures and decreasing humidity create stable atmospheric conditions, frequently leading to temperature inversions where cooler air is trapped beneath a layer of warmer air, preventing vertical mixing and concentrating pollutants near the ground. Agricultural burning, a common practice to clear fields for the Kharif (summer) crop, intensifies during this period, releasing substantial amounts of smoke and particulate matter. The post-monsoon season (October-November) sees a gradual improvement, but lingering smoke from agricultural practices and cooler temperatures can still contribute to localized pollution episodes. Winter months (December-February) are generally characterized by fog, which further restricts visibility and traps pollutants, creating a hazy and unhealthy atmosphere. 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 times. Maintaining indoor air quality through ventilation and air purifiers is also advisable. The monsoon provides a natural cleansing period, making it the most favourable time for outdoor pursuits, although occasional heavy rainfall can still impact visibility.