Air pollution: Delhi slips into ‘severe’ category as AQI hits 403; ‘orange alert’ issued

Delhi's air quality plunged to 'severe' levels with an AQI of 403, shrouded by toxic smog and dense fog. This hazardous pollution, exacerbated by calm winds and cold, is impacting visibility, delaying flights and trains. Health concerns are rising, especially for vulnerable groups, as experts predict the poor air to persist.