Electromagnetic fields (EMFs) from fluorescent lighting, particularly the magnetic component of the EMF, are an unrecognized problem in the interior environment of buildings, often mistaken for other problems such as bad indoor air quality. Facility managers and energy engineers must recognize this problem. Both core coil and solid-state electronic ballasts give off EMFs. The change in the lighting industry from core coil ballasts to solid-state electronic ballasts had changed the nature of the problem, not always for the better. The solution to the problem of EMFs from fluorescent ballasts is to reduce them, particularly the magnetic component of the EMF, and to use appropriate shielding materials. This article also provides a number of anecdotal reports of the serious nature of the problem, which can no longer be ignored by the lighting industry.