GMCs detected through the all-disk IRAM survey are plotted with orange asterisks over the 24 μm image of M 33 in the left panel. The ellipse encloses the SF disk, with a radius of 7 kpc, mapped in the CO J = 2−1 line by the IRAM all-disk survey. Small open squares indicate the selected MIR sources for the deeper CO pointed observations described in this paper, and the large open square indicates the mapped southern field. Asterisks inside open squares highlight the location of the new detected molecular clouds presented in this paper. They are plotted over the 24 μm image of M 33 in the left panel and over the FUV-GALEX image of M 33 in the right panel.