Zoom-in 2D maps of some nebula with intense O III emission, namely ID 40, ID 44, ID 50, ID 126, ID 127, and ID 128. From left to right: O III/Hβ, S III/S II, and MIRI F2100W maps. Green and orange stars indicate massive stars (Sect. B.1) and WR stars (Sect. B.2), respectively. Yellow plus symbols are young sterllar clusters from Corbelli et al. (2017) and the magenta circles, when present, indicate the associated molecular clouds. Cyan empty crosses refer to the YSOs from Peltonen et al. (2024).