Bengal weather alert: Cold wave tightens grip with dense fog, severe AQI in Kolkata; snowfall likely in Darjeeling

West Bengal is under a severe cold wave. Dense fog and falling temperatures are disrupting daily life. Air quality has worsened significantly. Kolkata recorded its coldest December morning. Sub-Himalayan districts are experiencing even lower temperatures. Light snowfall is possible in higher reaches. Fog is expected to persist, impacting travel by air, rail, and road.