On the 7th of April 2020 I wrote about the Website Generator of CumulusUtils. That appeared to be somewhat bigger than I expected, simply because it was about a full blown website with users interacting. And interaction generates comments. All has now stabilised and CumulusUtils works fine.
Meanwhile, on the background I had been working on a project to get going with air quality sensors like the PMS1003 ($14,20 at AliExpress) or similar cheap serial devices. In the back of my head always has been the creation of a multi sensor ‘sniffing’-centre to get a complete overview of the local airquality. Something worthwhile: I grew up in the neighbourhood of Rotterdam/Pernis an area known for its bad air and now I live south of Delfzijl, a small harbour in the North of the Netherlands with relative big industry area. 30 km North from there there are two large coal power plants and smog condition occur several times per year, though not often.