Lichen

Such good news for air quality, especially in urban areas.
Masses of lichen was one of the things we noticed early on, moving from Oxford, within sight and sound of a busy ringroad, to a very rural and thinly populated area. Our trees and pretty much everything else that doesn't get moved for a while are covered!
While people still have to work and that usually means travelling, I hope some of the few benefits that have come out of the pandemic can be retained.