Flock of racing pigeons equipped with pollution sensor and Twitter account select to the skies in bid to raise awareness of capital’s illegally dirty air They’ve been driven from Trafalgar square for being a nuisance, derided as rats with wings and maligned as a risk to public health.
But now pigeons could play a small share in helping Londoners overcome one of the capital’s biggest health problems – its illegal levels of air pollution blamed for thousands of deaths a year.
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Source: theguardian.com