Dīnhāta Air Quality Index (AQI)

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Dīnhāta, a municipality in the Cooch Behar district of West Bengal, India, occupies a relatively flat, low-lying terrain characteristic of the Indo-Gangetic Plain. Situated at approximately 26.13°N latitude and 89.47°E longitude, the city’s geography is profoundly shaped by its proximity to the Bangladesh border, lying just a few kilometers away. The surrounding landscape is dominated by agricultural lands, primarily rice paddies, interspersed with small pockets of deciduous forests. The Teesta River flows nearby, influencing local humidity and potentially contributing to localized fog formation during cooler months. Dīnhāta isn’t a major industrial hub, but regional brick kilns and small-scale agricultural processing contribute to particulate matter emissions. The urban-rural gradient is quite sharp; the city itself is a relatively small urban centre surrounded by a predominantly rural agricultural economy. This proximity to agricultural practices introduces seasonal burning of crop residue, a significant source of air pollution. The flat terrain hinders natural dispersion of pollutants, exacerbating air quality issues, particularly during periods of calm weather. The regional climate, a humid subtropical type, further influences pollutant behaviour, with high humidity promoting secondary pollutant formation. Understanding this geographic context is crucial for addressing Dīnhāta’s air quality challenges.

Dīnhāta’s air quality follows a distinct seasonal pattern. The post-monsoon season (October-November) often sees a peak in pollution, driven by the burning of crop residue after the rice harvest and the onset of cooler temperatures leading to temperature inversions, trapping pollutants near the ground. These conditions are particularly unfavourable for those with respiratory ailments. Winter (December-February) maintains elevated pollution levels due to continued temperature inversions and reduced wind speeds, hindering pollutant dispersal. Fog, common during these months, further concentrates particulate matter. The pre-monsoon season (March-May) brings increasing temperatures and some wind, offering a slight improvement, but dust storms can temporarily worsen conditions. The monsoon season (June-September) generally provides the cleanest air, as rainfall effectively washes away pollutants and increased humidity suppresses dust. However, increased moisture can also promote the formation of secondary pollutants. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular conditions – should limit outdoor activity during October-February. Monitoring local weather patterns and avoiding peak pollution times is advisable. Staying indoors with windows closed during high pollution days is recommended.