Stock photo: Smile, the air is fresh and pure
Stock photo: A young laughing boy looking through the bough of a tree covered in lichens.
Lichens serve as indicators of air pollution. In places of heavy pollution, few to no lichens are found. Lichen populations increase gradually with distance from these polluted p
Stock photo

#1424194 Smile, the air is fresh and pure by lovleah Stock photo lovleah

L JPG 2048 x 3072 pixels
6.8" x 10.2" | 17.3 cm x 25.9 cm @ 300dpi JPG
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