Nature’s air sensors are growing on your street
Grist
DECEMBER 8, 2021
A sprig of moss is growing on a tree in the Duwamish Valley, the most polluted area in Seattle. While that moss might seem ordinary, it has a secret superpower: It’s keeping a record of the pollution in the air — from the trucks, trains, planes, cargo ships, and hundreds of industrial facilities that surround it.
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