The National Air Filtration Association (Washington) has announced the winners of its Clean Air Award. They are: St. Charles Hospital, Oregon, OH; The Lone Star Park at Grand Prairie, Grand Prairie; The Rainbow Connection Early Childhood Development Center, Murrysville, PA; Vanderbilt University Medical Center, Nashville, TN; First City Tower, Houston; and Metro West Medical Center, Framingham, MA.

The award recognizes individuals and companies for their achievements in maintaining clean and comfortable environments through the use of proper air filtration.