The neighbours with the alpacas are making the most enormous, quasi-industrial racket. I went to see what they're up to and found they have the field that sits catty corner to our top field piled to the heavens with what I take to be firewood (or possibly fence posts) in different grades. The machine that's making the noise is mostly hidden behind trees but I suppose it's cutting and shaping the wood. Also the bits I can see of it are blue.
I've mostly lived in towns and cities and they were all quieter than this.