It is often claimed that the best sign of fresh clean air is that of Lichens growing on trees; the more Lichens, the purer the air quality.
Presuming that this observation is correct, I must be living in one of the best air-quality areas in the whole world. Some of our trees are so covered in Lichens, that one can no longer see any bark. The above is a branch of the Greengage tree just outside our front door.
It is also claimed that the first 'plants' to suffer as a result of polluted air are mushrooms; and in particular Girolles and the jet black Trompette de la Mort; both of which are particularly at risk.
2020 has been a bad year here for mushrooms. In spring we had just one meagre picking of Girolles, we had no Cèpes to speak of. Now in November we are finding very few Hedgehog Mushrooms, and not a single Trompette.
Of course, mushroom growth is dependent on the right amount of rainfall and warmth at the right time, and this is more likely the cause of their rarity this year rather than pollution. Rainfall is certainly a problem, with lakes and rivers being much lower than a decade or so ago.
When we first moved to the village, at this season I would go out looking for Hedgehog Mushrooms with a huge basket. It was always quickly filled, and I would go out again as soon as I'd unloaded them. The merchant came to the house every other day, and he never left without several kilos. I have just returned from the woods with nothing.