This is just a guess, but the deeper the NFL gets into its season, the louder fans get.
For competitive teams, fans have competitive reasons to get loud.
For non-competitive teams, fans have hostility and disappointment to crank out the best that vocal cords have to offer.
But there are always stadiums where noise is an element of the facility, like bricks, mortar and long lines at the restrooms.
Here’s our list of top 10 noise producers, places where ear plugs should be part of the ticket package.