  Secondary positrons produced inside Galactic Molecular Clouds (GMCs) can
significantly contribute to the observed positron spectrum on Earth.
Multi-wavelength data of GMCs are particularly useful in building this model. A
very recent survey implemented the optical/IR dust extinction measurements to
trace 567 GMCs within 4 kpc of Earth, residing in the Galactic plane. We use
the updated catalog of GMCs reported in recent papers, distributed in the
Galactic plane, to find the secondary positrons produced in them in
interactions of cosmic rays with molecular hydrogen. Moreover, by analyzing the
\textit{Fermi}-LAT data, new GMCs have been discovered near the Galactic plane.
We also include some of these GMCs closest to the Earth, where cosmic ray
interactions produce secondaries. It has been speculated earlier that cosmic
rays may be reaccelerated in some GMCs. We select 7 GMCs out of 567 GMCs
recently reported, within 4 kpc of Earth, where reacceleration due to
magnetized turbulence is assumed. We include a hardened component of secondary
positrons produced from the interaction of reaccelerated CRs in those 7 GMCs.
We use publicly available code \texttt{DRAGON} for our simulation setup to
study CR propagation in the Galaxy and show that the observed positron spectrum
can be well explained in the energy range of 1 to 1000 GeV by our
self-consistent model.
