Abstract: ON JANUARY 10, 1985, A WORKER REFINISHED A BALLROOM FLOOR AT THE HOLIDAY INN WOODLAWN, IN CHARLOTTE, NORTH CAROLINA, USING A POLYISOCYANATE COATING. AT 11 AM THE HOUSEKEEPING STAFF ATE LUNCH IN A ROOM NEXT TO THE BALLROOM. AFTER RETURNING TO WORK AT APPROXIMATELY 12:15 PM, MANY OF THE EMPLOYEES COMPLAINED OF DIZZINESS AND NAUSEA. 32 EMPLOYEES WERE TAKEN TO THE HOSPITAL ,EXAMINED AND RELEASED. NONE WERE KEPT FOR TREATMENT. AS A PRECAUTION, ONE WING OF THE HOTEL WAS EVACUATED. THE INCIDENT OCCURRED BECAUSE OF POOR VENTILATION AND BECAUSE THE VAPORS WERE TRANSPORTED TO OTHER ROOMS BY THE AIR CONDITIONING SYSTEM.