In April 2018, the stadium operating company commissioned a study into the noise levels produced at Hampden during an Old Firm match. This found a peak noise level of 115 decibels, after goals were scored, and 109 decibels when the teams first came onto the field. These findings were much higher than those recorded in a 2014 study of Premier League grounds (maximum of 84 decibels), but well short of the world record set by a National Football League match at the Arrowhead Stadium in Kansas City (142 decibels).