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Greenpeace advocates in Germany had worked closely with refrigeration engineers to develop what came to be known as Greenfreeze cooling equipment: machines that used hydrocarbons, including isobutane and propane, as refrigerants.

Propane and isobutane - also in Giorgia's deodorant - were mentioned in 123 and 38 deaths respectively.

Look for any ingredients that end in “-ane,” such as propane, butane and isobutane, Plescia said.

One source of unintentional benzene comes from propellants such as isobutane.

Two damaged gas pipelines leaked isobutane and propylene, flammable chemicals that are hazardous to human health.