  This document provides a brief summary estimate of Galactic free-free
emission and H-alpha emission and their relationship. Particular emphasis is
placed on estimating the potential free-free emission in the region of
significant confusion for CMB anisotropy measurements. Existing x-ray,
ultraviolet and H$\alpha$ emission provide limits on the radio free-free
emission and vice versa. These limits are generally somewhat smaller than the
observed ``free-free'' (signal proportional to frequency^{-2.15}) microwave
signal. If this remains true, then some previously neglected source may be
present. Physics argues that H-alpha emission is still the best tracer for
Galactic free-free emission and thus a tool for diagnosing if there is a
previously neglected emssion source.
