The Department of Chemistry has Badger Seal Mask Fitters (https://making.engr.wisc.edu/mask-fitter/) available for those working in the building.
They create a more firm seal for your mask so that more air is filtered through the mask rather than seeping in/out around the edges. They also help prevent glasses from fogging. Those working in the building may pick one up from a table in the Shain lobby. Only take one if you plan to use it.