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They called back.

They didn’t really want to answer any questions, but I heard all sorts of fuzzy-feel-good crap about how BAT wants to promote coexistence between smokers and non-smokers and how they’re going to exchange the air in pubs so that no-one will notice that cigarette smoke is slowly killing anything that gets in its way.

They won’t exactly reduce the CO2 concentration to 20% of the value set by Health and Safety. “We reduce it to 20% of the Treshhold Limit Value of 5000 ppm.”

(At 2000 ppm the majority of occupants of a room will feel a significant degree of discomfort, and many will develop nausea and headache)

And by shoving the CO2 back into the atmosphere, “it can revert to oxygen and nitrogen”.

New to me. I learned that it was removed from the atmosphere by photosynthesis.

“That’s what I mean”

So that’s OK then.

So you remove all the bad stuff from a confined space and replace it with good stuff.

Nitrogen and oxygen, too?

“Yep. All that bad stuff”

Except they don’t remove

Carbon monoxide Hydrogen cyanide Formaldeyde Acrolein Acetaldehyde Hydrazine Vinyl chloride Urethane Quinoline Benzopyrene Methylfluoroanthene Dibenzacridine Chrysene

Which shouldn’t be there in the first place.