Caroline Lucas will show her support for striking firefighters by joining the picket line at Preston Circus in Brighton today.
Firefighters are striking between 12pm and 4pm over pensions and concerns that they will have to work until they are 60-years-old, with many being unable to meet fitness standards.
Caroline said, "This action is not just about fair pensions but also about public safety. It is dangerous and unfair to expect them to fight fires and rescue families into their late fifties.
"I am very please to add my support."
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Union members will hold rallies across the UK as part of the strike action over a rejected 1.1% pay offer.
Wednesday morning's weather for the east of the region
Wednesday morning's weather for the west of the region