About 200 people across the two boroughs will be trained over 12 months. Medical kits are also likely to be distributed to businesses around King's Cross, brought to a standstill when the July 7 terror bombings in 2005 killed 52 people.
Sergeant Andrew Wadeson, of Islington police, said: "In these times, where terrorism is a very real threat to the community, this will equip staff within local businesses with important skills in the event of a major incident or attack on the borough. I am pleased that we are the first boroughs in the Met to offer this service."