Police are appealing for witnesses following a death in Ilford. They were called at three o'clock on Wednesday afternoon to reports a boy had fallen from scaffolding from a two storey home in Camden.
Alfie Perrin, 16, was treated at the scene and taken to an east London hospital where he later died. His death is being treated as unexplained.
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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.