London Assembly member Darren Johnson has obtained data on modelled fire response times before and after the proposed cuts come into force.
The following wards will see first response times worsen by over a minute.
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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.