It may not be a formworks per se'.. it is an above ground which has "gunnite" like cement and foam sprayed around the outside shell.
I think the outdoor stoves burn a lot cleaner than a fireplace. Like almost every lawmaker has. I am fairly certain if your figure out how many "particulates" go into the harvesting refining and transporting of oil, and compare it to gathering wood on my own woodlot. The outdoor stove wins, plus it is really renewable and not just able to be considered renewable because of a carbon tax. (phony renewables).
Sort of like an Electric car versus a an economical gas car when figuring in production, battery and electricity generation carbon usage.
I totally understand a "city" not wanting them because of the smell, some people do not like that and if everyone in a city has one, there is a haze over the area. If every home on a city block had one it would be yucky. Out in the country not so much.. BTW Just for full disclosure and honesty, I dislike the EPA. Just my redneckedness coming through, so ignore me.