  The Planck space mission has observed the first three rotational lines of
emission of Galactic CO. Those maps, however, are either noisy, or contaminated
by astrophysical emissions from different origin. We revisit those data
products to deliver new full-sky CO maps with low astrophysical contamination
and significantly enhanced noise properties. To that effect, a specific
pipeline is designed to evaluate and postprocess the existing Planck Galactic
CO maps. Specifically, we use an extension of the Generalized Needlet Internal
Linear Combination method to extract multi-component astrophysical emissions
from multi-frequency observations. Well characterized, clean CO full-sky maps
at $10^\prime$ angular resolution are produced. These maps are made available
to the scientific community and can be used to trace CO emission over the
entire sky, and to generate sky simulations in preparation for future CMB
observations.
