The loudest crowd roar at a sports stadium is 137.6 dbA and was achieved by fans of the Seattle Seahawks, aka “Volume 12 – The Seahawks 12th Man” (USA), at Centurylink Stadium in Seattle, Washington, USA, on 2 December 2013.
The record was achieved with 12 mins 29 secs left to play in the second quarter during a 3rd down Seahawks defensive stand.