London Underground is polluted with ultrafine METALLIC particles that are small enough to end up in the bloodstream

study found the London Underground is filled with ultrafine metallic particles
The tiny particles can be easily breathed in and enter people’s bloodstreams
The Cambridge University study says the health risks posed remain unknown
Particles of iron oxides have been detected as having five nanometre diameters

Every day, more than five million Londoners board the London Underground on their daily commute.

But if you take the tube to work, a new study could have you searching for alternatives methods of transportation.

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