Routes 12, 35, 40, 45, 68, 148, 171, 176, 468 & P5 remain subject to delay/diversion on Walworth Road, Southwark due to a fire.
A215 Walworth Road remains closed both ways btwn Elephant & Castle and Browning Street due to a building fire.
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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.