There have been calls to postpone or cancel the event and the Delhi High Court had issued a notice to the race organisers after the Indian Medical Association wrote a letter to the Court in this regard.
But the likes of Kenyan Kirui and Ethiopian Ayana have no such concerns and said they were looking forward to the race. The international elite athletes reached India yesterday and were introduced to the media today.
On Sunday, 25-year-old Ayana, who also won the 10,000m gold in the London World Championships in August, is setting foot on the Indian soil for the first time and will also be making her debut over the half marathon distance.
She is running only the second international road race in her career after the a 10,000m race way back in 2010 in Angola.
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Ayana is currently the leading women's long distance runner in the world. She is also the second fastest runner of all time in 5000m. She won a 5000m silver in the London World Championships and is one of the three nominated for the IAAF Women Athlete of the Year.
"After World Championships, I continued training. There are not many good competitions so I trained hard for ADHM. Even though it's a new territory, I'll do my best," she said.
Kirui, who won the marathon gold London World Championships, said he was not going to be bothered by the talks of pollution level in the national capital.
Kirui is familiar with the picturesque circuit in Delhi as he was sixth in a high-quality field two years ago. He has a personal best of 59:38. He said the course here is a good one but the weather makes it tough to come up with fast timings.
The men's course record of Delhi Half Marathon is 59:06, set by Ethiopia's Guye Adola in 2014 while the women's course record has been standing since 2009 and belongs to Kenya's Mary Keitany at 1:06:54.
Despite his impressive credentials which also include a win in the Boston Marathon in April, Kirui will not start as an outright favourite in the 21.097 km distance.
Ethiopia's Yigrem Demelash ran 59:19 in the RAK Half Marathon in the United Arab Emirates in February and he will be determined to climb one step higher on the podium after finishing second here last year.
In women's race, Ayana will face her compatriot Worknesh Degefa, who is not only the defending champion but the fastest woman in the field having clocked 1:06:14 last year.
The winners of both the men's and women's elite races will pocket USD 27,000 each and the total prize money purse (combined men and women) of the IAAF Gold Label Road Race has been pegged at USD 275,000.
The Indian challenge will be led by men's defending champion G Lakshmanan, who will face competition from 2015 edition winner Nitender Singh Rawat. Olympian Sudha Singh will be headlining the elite Indian women's line up.