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We identify giant molecular clouds (GMCs) associated with HII regions for asample of 19 nearby galaxies using catalogs of GMCs and H regions released bythe PHANGS-ALMA and PHANGS-MUSE surveys, using the overlap of the CO andH{\alpha} emission as the key criterion for physical association. We comparethe distributions of GMC and HII region properties for paired and non-pairedobjects. We investigate correlations between GMC and HII region propertiesamong galaxies and across different galactic environments to determine whetherGMCs that are associated with HII regions have significantly distinct physicalproperties to the parent GMC population. We identify trends between theH{\alpha} luminosity of an HII region and the CO peak brightness and themolecular mass of GMCs that we tentatively attribute to a direct physicalconnection between the matched objects, and which arise independently ofunderlying environmental variations of GMC and HII region properties withingalaxies. The study of the full sample nevertheless hides a large variabilitygalaxy by galaxy. Our results suggests that at the ~100 pc scales accessed bythe PHANGS-ALMA and PHANGS-MUSE data, pre-supernova feedback mechanisms in HIIregions have a subtle but measurable impact on the properties of thesurrounding molecular gas, as inferred from CO observations.

The impact of HII regions on Giant Molecular Cloud properties in nearby galaxies sampled by PHANGS ALMA and MUSE