David Zalubowski/AP A sign encouraging the use of face coverings stands outside the History Colorado Center as traffic passes southbound on Broadway Wednesday, Oct. 14, 2020, in Denver. On a sunny Tuesday, a man sits in his SUV in the parking lot of a Highlands Ranch big box store. Matt Dority carefully looks at the faces passing him by. He explained what he was watching for. “Are they wearing a mask? Do they have a mask, but it's not fitted correctly? Or did they just have no mask on at all?” Dority is a volunteer, tracking mask use for Tri-County, the health department for Adams, Arapahoe and Douglas counties. The agency is the only one in Colorado to compile mask data throughout the pandemic. Dority, himself in a yellow mask of the surgical variety, keeps track via an app on his phone. He runs through what he’s seen so far.