Where the air is clear...

*As with all the photos on this blog, click to see full size.

Quite by accident, while driving home from hospital visiting, I found myself this afternoon listening to Radio Four. The programme was "Gardeners' Question Time" (and entertaining it was too.)
One of the gardening "problems" discussed had to do with lichen growing on a gooseberry bush. A member of the experts panel observed that wherever the questioner lived there must at least be clean air because lichens only thrive where the air is unpolluted.
With that in mind the above photo is surely perfect proof of the pure air of the Scottish Highlands!