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Re:Burning Out: What Really Happens Inside a Crematorium by pmyteh on Monday March 05, 2018 @06:14AM (#16520244)
It is released into the atmosphere, and is a very significant source of environmental mercury pollution. More recent crematoria have scrubbers to specifically remove it from the flue stream.
Re:Burning Out: What Really Happens Inside a Crematorium by pasbesoin on Tuesday March 06, 2018 @12:22AM (#16527047)
I couldn't imagine what else would happen, nor that it's being removed beforehand. At least they're starting to scrub it.

I also wonder about it with respect to burial. There are arguments about just how inert/stable it is, in one's mouth.

Fill a field with small deposits that will reside for decades if not centuries...

Long term problem. But, like other metal toxins, one that doesn't simply decay and go away.