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Smile the air quality is pure. Lichens are excellent bioindicators of air pollution. In areas of heavy pollution few to no lichens are found and increase with distance from polluted areas.
Keywords:
joy
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childhood
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outdoors
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portrait
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day
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laughing
caucasian ethnicity
tree trunk
springtime
children only
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summer
looking at camera
lifestyles
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males
one boy only
toothy smile
one person
air pollution
hide and seek
hide and seek photos
distance study
the pure
forest talk
no image found
the population
location based
looking up at the forest
air fresh
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