@Edent
Well, there are downpipe generators...
But they are unlikely to produce enough to be viable, even in the UK.
And also this
But I don't think it has made it out of the lab yet.
https://pubs.acs.org/doi/full/10.1021/acscentsci.4c02110
https://www.youtube.com/watch?v=mYm49Kd4Gy8