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Ratios of polycyclic aromatic hydrocarbon (PAH) vibrational bands are apromising tool for measuring the properties of the PAH population and theireffect on star formation. The photometric bands of the MIRI and NIRCaminstruments on JWST provide the opportunity to measure PAH emission featuresacross entire galaxy disks at unprecedented resolution and sensitivity. Here wepresent the first results of this analysis in a sample of three nearbygalaxies: NGC 628, NGC 1365, and NGC 7496. Based on the variations observed inthe 3.3, 7.7, and 11.3 $\mu$m features, we infer changes to the average PAHsize and ionization state across the different galaxy environments. High valuesof F335M$_{\rm PAH}$/F1130W and low values of F1130W/F770W are measured in H IIregions in all three galaxies. This suggests that these regions are populatedby hotter PAHs, and/or that the PAH ionization fraction is larger. We seeadditional evidence of heating and/or changes in PAH size in regions withhigher molecular gas content as well as increased ionization in regions withhigher H$\alpha$ intensity.

PHANGS-JWST First Results: Measuring PAH Properties across the multiphase ISM