That's an interesting point as well. Considering the Sulphur that is added to natural gas so that we can smell gas leaks is converted into SO2 and SO3 (in smaller quantities) during combustion, and these are both highly toxic.
I'm by no means an expert on this stuff...I just read. It seems that natural gas is a bigger culprit than propane but neither are optimum (this would also include furnaces or other sources of heat, of course).
These are the biggest issues: nitrogen dioxide, carbon monoxide, and formaldehyde
Followed by a slate of others: methane, radon and other radioactive materials, BTEX (benzene, toluene, ethylbenzene and xylene), organometallic compounds such as methylmercury organoarsenic and organolead, mercaptan odorants, fine particulates, and polycyclic aromatic hydrocarbons, etc
I realized this when I was redoing my kitchen. And apparently, range hoods are almost universally useless. Fans aren't sized correctly, room size has to be considered and they'd basically have to be so close to the range that you couldn't even cook on them. I suspect they're better than nothing but not by much. I believe the New England Journal of Medicine is about to come out suggesting a ban on the sale of them.
Edited by August West, 09 December 2020 - 01:07 AM.