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The high mass loss rates of stars in their asymptotic giant branch (AGB)stage of evolution is one of the most important pathways for mass return fromstars to the ISM. In the planetary nebulae (PNe) phase, the ejected material isilluminated and can be altered by the UV radiation from the central star. PNetherefore play a significant role in the ISM recycling process and in changingthe environment around them. We show some highlights of the results ofobservations that have been carried out using the Spitzer instruments to studythe gas and dust emission from PNe in the Milky Way and nearby galaxies.Spitzer is especially sensitive to the cool dust and molecules in the PNe shelland halos. We present new results from our program on Galactic PNe, includingIRAC and IRS observations of NGC 6720 in the ring and halo of that nebula.

Planetary Nebulae: Exposing the Top Polluters of the ISM