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RE: The Amateur Mycologist #38 - The Lichen/Fungi Of Geneva, Switzerland ('s Airport) - Xanthoria Lichen, Corprinoid Mushroom, Likely Auricularia Species, And More
I do recognize both types of lichens in your first picture from home, they happen to grow on everything from treebark to large natural stones.
But that's fine, they are an indicator for good air quality after all, aren't they?
In general yes. Lichen are certainly a positive sign in general for the health of local ecosystems.
Having said that, this particular genus seems highly resistant to pollutants - which is to say, it's presence wouldn't be a bad sign for the cleanliness of a local environment, but neither would it be definitively indicative of low pollution levels.
I heard Xanthoria species grow on rocks less readily overall, and perhaps with a preference to rocks regularly bathed in bird poop. Just a funny anecdote.