I believe you are “technically” correct, but colloquially, “microplastic health effects” are believed to come from drinking water and food. Not industrial pollution, which is apparently what Philips’ machine is microdosing their users with.

Colloquially, but we’re not talking colloquially, we’re talking about the Phillips machine and the fact that people’s lungs were being forced air of which included plastics.

I wasn't providing an answer I was presenting a question like what the other commenter was, which is could those health effects have come from microplastics emitted from the foam.

I’ve just read the FDA response which says:

The potential risks of particulate exposure if inhaling or swallowing pieces of PE-PUR foam include:

Irritation to the skin, eyes, nose, and respiratory tract (airway), Inflammatory response, Headache, Asthma, Toxic or cancer-causing effects to organs, such as kidneys and liver.

So it looks like it is the case

Sounds like we just need to wait to accumulate a bit more of them?

The dose makes the poison.

Not really. For many things there is no "safe" level, eg. airborne PM2.5 pollution or lead.

What you say is a bit of a common sense rule of thumb usually used for stuff we digest and poop out.

So that may rule out microplastics, which was shown to cross into tissue (including lungs) which means it would accumulate. And definitely nanoplastic, as those enter even individual cells and screw up their mechanics.

I wouldn't be surprised if in a few years we would consider no safe level of micro/nanoplastic exposure. Maybe we would already if not for the interests of manufacturers and oil industry.

I guess maybe you were agreeing with me but I responded as if you weren't