Delhi chokes under smog: AQI hits ‘severe’ level; flight, train services hit as visibility dips

Delhi grappled with severe smog, air quality hitting 'severe' levels with AQI at 414. Authorities invoked GRAP-4, deploying water sprinklers to combat pollution. Dense fog disrupted flights and trains across northern plains. While some improvement is expected, air quality may remain poor. Temperatures are set to plummet.