(CNN) Flights to and from New Delhi's international airport were delayed and diverted on Sunday as pollution reached "unbearable" levels, leaving the Indian capital blanketed with heavy smog . Visibility was so poor that 37 flights -- including at least one international journey -- were diverted from the city's Indira Gandhi International Airport, a senior airport official told CNN. On Sunday, major airlines including Air India and SpiceJet warned of delays and cancellations to flights to and from the international airport. #WeatherUpdate: Due to poor visibility at Delhi (DEL), all departures/arrivals and their consequential flights might get affected. Update Issued at 1500 hours: The visibility at Delhi airport is improving.

Source: CNN November 03, 2019 16:07 UTC