The CAZ comes into force on 28 November and non-compliant cars and vans that are not entitled to an exemption will be charged £9 a day to enter the city centre.
"Some of these people might have been in water, they might have been on cliff edges, they might have been outside for hours and hours and hours with hypothermia," Imogen Fox said.
"It is better to have a bigger space in order for them not to feel claustrophobic or have lots of people around them in really close proximity."
"There are other emergency services but they are so stretched beyond capacity that often people will wait up to 12 hours for a paramedic to go and get them from somewhere unsafe," they said.
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