Firefighters from Carroll and Baltimore counties investigated an odor in a two-car, two-story garage in the 5100 block of Hoffmanville Road near Alesia Monday night.
Units from Lineboro and Manchester responded to the initial call at at 7:31 p.m. Lineboro firefighters noticed an unusual odor upon arrival, but were unable to identify the smell even with a four-gas monitoring instrument.
The Baltimore County hazardous materials unit, based in Brooklandville, was not able to determine the cause of the odor with its monitors. The Maryland Department of the Environment, using different instruments, detected a very slight odor, but found nothing life-threatening, according to a spokesman.
Fire units were out for 3 hours, 21 minutes.