The AIBA Women's World Boxing Championships is taking place in an indoor stadium from Thursday through to Nov. 24 but teams are complaining about a toxic smog hanging over the city, caused by seasonal burning of crop stubble and emissions from vehicles and industry.
The weather, with no wind to blow the pollution away, has aggravated the problem in one of the world's most polluted cities.
"My family is worried. We know it is not good for our body," said 27-year old Bulgarian Stanimira Petrova, a gold-medallist in the bantamweight category in the championships in 2014.
"It's difficult. I wear a scarf but I have to get accustomed."
On Tuesday, the level of deadly particulate matter PM 2.5 that lodge deep in the lungs was at 407, about eight times the safe limit, according to a reading by the pollution control board.
Authorities have banned the entry of heavy vehicles into the city and ordered construction work to stop and sprinklers to keep down the dust. But the air quality remains in the severe zone.
Seven European boxers whom Reuters spoke to complained that the air left a bad taste and irritated their eyes.
Their coaches said they were advised about the poor air but organisers had not given them any protective gear.
Ajay Singh, president of the Boxing Federation of India, said Delhi's air quality was improving as the effects of last week's Hindu festival of Diwali - when tens of thousands of firecrackers are let off, clogging the air with smoke - were wearing off.
"I'm confident there will not be any problems faced by the boxers especially with the championship being held indoors. We have all the necessary standards maintained and precautions taken."
Indian Olympic flyweight bronze medallist M.C. Mary Kom is among those taking part.
French coach Anthony Veniant said he had asked for the tournament to be moved out of Delhi but his request was turned down.
"We feel the air is no good. Some of the parents of these players are worried and we tell our players to restrict their time outside," Veniant said.
Prolonged exposure to high levels of PM 2.5 and PM 10, another pollutant, leads to respiratory illnesses. Doctors in Delhi have reported an increase in the number of patients with respiratory problems.
Jay Kowli, secretary general of the Boxing Federation of India, said the air quality was being monitored but ruled out any change of location.
"Shifting the venue is impossible. Delhi has the best sports facilities in the country," Kowli said.
Teams have been hard at training this week.
Daniel Nash, the coach for the Swedish team, said pollution was a problem, but he had asked the boxers to focus on the competition.
"I'm telling my players to not let this issue affect their game," Nash said.
Contestants just have to deal with it, said Abdul Fkiri, the coach of the Dutch team. (Reporting by Neha Dasgupta Editing by Sanjeev Miglani, Robert Birsel)
(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)