Evergreen needles act as air quality monitors

ScienceDaily
Sep 15, 2020, 7:42 pm216 pts
Every tree, even an evergreen, can be an air quality monitor. That's the conclusion of researchers who measured the magnetism of particulate matter on the needles of evergreen trees. That measurement, they found, correlated to general air quality, suggesting that analysis of the needles -- a relatively simple…

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