Mine were always indoors, from those old ones with place for two, to modern ones with a sort of spanner to mix it all... They stink in various degrees up to like impossible. Outside it might be totally okay I guess (if it's not in the winter or the muskitoes are not on a war path).

you eat bismuth subgallate and it neutralizes the scent when you digest. it's for people with missing digestive tracts.

Dry saw dust does a whole lot of work in these toilets.

Petrol maybe 😁