Composite colour image of H ii regions, as seen by Spitzer. Red is the MIPSGAL image at 24 μm showing the emission of the hot dust, green is the GLIMPSE image at 8.0 μm dominated by the PAHs emission from the PDRs, and blue is the GLIMPSE image at 4.5 μm showing the stellar sources. Sh 201 is a textbook example of a bipolar H ii region; the red column density contours trace the parental molecular filament (levels of 2, 5, and 15 × 10²² cm^-2). N10 and N11 are adjacent bubbles around distinct H ii regions. This is a case of mis-identified bipolar nebula. G308.7-00.5 is a nebula associated with an evolved star.