Composite colour image of the W5 region. Red is the radio-continuum emission of the ionized gas at 1.42 GHz (CGPS map); turquoise is the Spitzer-IRAC 8.0 μm PAH emission. The two 8.0 μm bubbles surround the H ii regions W5-E and W5-W. The yellow crosses lie at the position of the exciting stars of W5-E and W5-W. Most of the compact radio sources in the field are extragalactic sources. North is up and east is left.