claim: Pulmonary embolism is indicated by low blood oxygen levels.
evidence: Airtel Delhi Half Marathon -LRB- ADHM -RRB- is an annual half marathon foot-race held in New Delhi , India .. half marathon. half marathon. New Delhi. New Delhi. India. India. Established in 2005 , it is both an elite runner and mass participation event .. It is an AIMS-certified course and is listed as a Bronze Label Road Race by the IAAF .. Road. Road running. AIMS. Association of International Marathons and Distance Races. IAAF. IAAF. The 2009 event attracted around 30k runners who competed in one of the four races  : The event includes the half marathon , the 7 km Great Delhi Run , a 4.3 km run for senior citizens , and a 3.5 km wheelchair race .. half marathon. half marathon