Helena, MT -

A state official says air tests revealed acceptable lead levels in the former National Guard armory building that houses nearly 100 Department of Environmental Quality employees.

Department of Administration Director Sheila Hogan said Thursday the 22 airborne tests all resulted in lead levels less than the standard 25 micrograms per cubic foot.

Surface tests in the work areas also resulted in lead levels below the accepted threshold except for one room.

The tests were ordered after lead levels up to 40 times federal standards were found above the ceiling in the downtown Helena building.

The employees have been relocated to offices near the Capitol and the airport, and they are being offered free blood tests.

Hogan says the building is likely to remain closed for months while it is re-mediated.