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Soot trapped in the feathers of songbirds over the past 100 years is causing scientists to revise their records of air pollution.
US researchers measured the black carbon found on 1,300 larks, woodpeckers and sparrows over the past century.
They've produced the most complete picture to date of historic air quality over industrial parts of the US.
The study also boosts our understanding of historic climate change.
Article here
US researchers measured the black carbon found on 1,300 larks, woodpeckers and sparrows over the past century.
They've produced the most complete picture to date of historic air quality over industrial parts of the US.
The study also boosts our understanding of historic climate change.
Article here
