Oh, sure, you can easily build your own propane pilot light to release a bit of CO2 indoors and it'll very likely be perfectly safe. But I don't think you could

Oh, sure, you can easily build your own propane pilot light to release a bit of CO2 indoors and it'll very likely be perfectly safe. But I don't think you could sell it to other people. Most of those "mosquito" capture devices that use UV are very effective at killing everything else except for mosquitoes. Including a lot of stuff that probably shouldn't be killed.