In an effort to assess the potential exposures and risks from lead (7439921) while performing custodial activities, janitorial and custodial workers at a university in Maryland were targeted for study. Custodial operations that were monitored included painting, carpentry, housekeeping, plastering, plumbing, and general maintenance. Airborne lead concentrations among 16 university workers ranged up to 36 micrograms/cubic meter. Lead concentrations from four of the five personal breathing zone air samples collected on housekeepers emptying trash receptacles, sweeping floors, and vacuuming carpets were not detectable. All personal breathing zone results were below the OSHA permissible exposure limit of 50 micrograms/cubic meter. Blood lead levels of surveyed employees ranged from 2.8 to 10 micrograms of lead per deciliter of blood, with a mean of 5.4 micrograms/deciliter. These were typical findings for adults in the United States.