Star formation in galaxies is regulated by the heating and cooling interstellar medium. In particular, processing of molecular gas into stars will depend strongly on ratio to neutral around sites recent star-formation. this work, we combine mid-infrared (mid-IR) observations Polycyclic Aromatic Hydrocarbons (PAHs), dominant mechanism medium (ISM), with [C II], [O I], [Si II] fine-structure emis...