Polycyclic Aromatic Hydrocarbons (PAHs) and dust in HII regions and Photodissociation regions: Ground-based IR observations in the JWST era

The IR sky is aglow with emission from HII regions and Photodissociation regions. Their IR signature is extremely rich revealing strong HI recombination lines, atomic fine-structure lines, molecular hydrogen lines, Polycyclic Aromatic Hydrocarbon (PAH) emission and dust continuum emission. As such, these regions are a prime target for ground- and space-based IR facilities. In this talk, I will discuss how synergies between ground-based facilities and JWST can advance our understanding of HII regions and Photodissociation regions, in particular with regards to PAHs and dust which dominate the IR emission of these regions. I will highlight present and future ground-based observations that will complement the JWST Early Release Science Program “Radiative feedback from massive stars” which will observe the Orion Bar