  We present a statistical analysis of the local, approximately 50-100 pc
scale, H-alpha emission at the locations of recent (less than 125 years)
supernovae (SNe) in nearby star-forming galaxies. Our sample consists of 32 SNe
in 10 galaxies that are targets of the PHANGS-MUSE survey. We find that 41%
(13/32) of these SNe occur coincident with a previously identified HII region.
For comparison, HII regions cover 32% of the area within 1 kpc of any recent
SN. Contrasting this local covering fraction with the fraction of SNe
coincident with HII regions, we find a statistical excess of 7.6% +/- 8.7% of
all SNe to be associated with HII regions. This increases to an excess of 19.2%
+/- 10.4% when considering only core-collapse SNe. These estimates appear to be
in good agreement with qualitative results from new, higher resolution HST
H-alpha imaging, which also suggest many CCSNe detonate near but not in HII
regions. Our results appear consistent with the expectation that only a modest
fraction of stars explode during the first 5 Myr of the life of a stellar
population, when H-alpha emission is expected to be bright. Of the HII region
associated SNe, 8% (11/13) also have associated detected CO(2-1) emission,
indicating the presence of molecular gas. The HII region associated SNe have
typical Av extinctions approximately equal to 1 mag, consistent with a
significant amount of pre-clearing of gas from the region before the SNe
explode.
