Plenum-rated cables have been around for a long time.  These are cables that are built with a jacket material that is designed to give off low amounts of smoke and toxic gas, and retard flame travel.  Recently, new jacket materials have been developed with the description, Low Smoke/Zero Halogen, or LSZH.  These new cables give off even fewer toxic and caustic fumes than plenum-rated cables.  They are not currently found in widespread use in North America, with applications limited mostly to government, military, and aerospace industries.

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