The reporting in this leaves a lot of questions. I can understand pieces of foam, but that the machines were harming people by blowing _gas_? The air that we breathe is a mixture of gases. What other type of harmful gas could a CPAP machine blow?
Polyester polyurethane particles which may or may not be visible to the naked eye. These particles can break down further into volatile organic compounds which are vapors. All of these are toxic and carcinogenic.