I probably do.  "toxic" and "poisonous" mean causing an actual chemical
reaction which is harmful to you.  Nausea (which can be caused by a
bad smell, or motion, or many other reasons) doesn't qualify.  It may
be unpleasant to be exposed to the smell (which isn't actually from
the methane, but from various other decomposition products, etc., that
are typically mixed in), but moving out of the affected area is enough
to take care of it.  That isn't the case if you are exposed to carbon
monoxide from breathing car exhaust fumes, or eat deadly nightshade
or yew berries or the wrong sorts of toadstools, or are bitten by a
venomous snake or spider - those have persistent effects which often
require medical treatment.

On Fri, Dec 17, 2021 at 01:34:11PM -0500, ann sanfedele wrote:
> what it prompted in me was nausea.. but you may have a narrower definition
> of toxic than I do.
> 
> I have a photo of that sign we encountered along the ALACAN somewhere..
> 
> On 12/16/2021 8:13 PM, John Francis wrote:
> > On Thu, Dec 16, 2021 at 05:49:37PM -0500, ann sanfedele wrote:
> > > re poisonous - um -- methane certainly falls under that category.
> > I don't think so - it's non-toxic. It will choke you if you breathe
> > it instead of regular air, but the same is true of pure nitrogen.
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