After some people took readings at some stadiums, they found that the Seattle Seahawks have the loudest fans and stadium. Also why they call the noise the 12th man !
Which NFL team do you really think has the loudest fans?
Kansas City Chiefs fans' broke Seattle Seahawks' fans' record of having the loudest outdoor stadium by creating 142.2 decibels worth of noise at Arrowhead Stadium Monday night. The Chiefs tweeted a celebratory infographic declaring Arrowhead the loudest stadium in the world.