Studies have shown that as much as 85% of dirt in your office comes in right through the front door, not through the open windows, not through the AC units, through the front door.
So Why do so many offices not have decent mats at their entrances.
The dirt walks right up the stairs on our shoes and straight into the office. It would be great  if someone could tell everyone to wipe their feet as they enter, but that’s not going to happen. However having the proper matting can make all the difference.