Nature's air sensors are growing on your street


Moss get their nutrients from the air, providing a snapshot of the air quality around them. A team of scientists in Portland seized upon this. In 2013 they sampled moss from over 300 trees in the city. It was cheaper than installing air quality monitors. They found a cluster of pollution in one neighborhood near a glass factory. In Seattle, the practice was replicated, but it was done by youth from the community. The sampling confirming high levels of bad air quality in one neighborhood. In both cities, the samples led to higher air quality standards and stricter enforcement.

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