India, Dec. 23 -- Delhi and the National Capital Region (NCR) woke up to another winter morning under a blanket of smog on Tuesday, with visibility in parts of Ghaziabad and Noida slipping to as low as zero. Visibility dropped sharply at Delhi's Indira Gandhi International Airport early morning, with India Meteorological Department (IMD) observations showing the general visibility at just 50 metres at 8:00 am IST.

Over 200 flights have been delayed and at least 10 cancelled at Delhi's iGI Airport so far as dense fog reduced visibility, officials said.

Meanwhile, air quality slipping deeper into the 'severe' zone in the capital city. By 8 am, the Air Quality Index (AQI) stood at 414, data from the Central Pollution Control Board's Sameer...