Some Prince George’s County employees in the county administration building in Upper Marlboro were complaining Tuesday about air quality, when the building reopened five days after flooding.

County Council administrator Robert Williams notified council employees via e-mail that they are permitted to leave but must remain in contact with their supervisors, as well as take any needed files with them.

Because of the flooding, the council already had planned to meet at a county building in Riverdale Tuesday for its regularly scheduled session that ordinarily is held in the county administration building. Many council staff members, as well as the nine-member council, are at the Riverdale site.

County officials have been mopping up the Upper Marlboro building since last week’s flooding, and on Monday a contractor began chemical fumigation there On Tuesday, some employees complained of an ammonia-like odor in the building. The ground floor had been soaked with up to two feet of water on Thursday after a pond nearby overflowed its banks and flooded the building, which opened in 1977.