Artificial oxygen oasis in an otherwise CO2 atmosphere

I wonder if it is possible to install artificial equipment that would exhaust oxygen into air in otherwise CO2 atmosphere so that locally people could breath in open air without any kind of tent or dome?

I mean, imagine a public park with walking lanes with benches and there are oxygen holes in the pavement that constantly inject oxygen into air so that people can party in the open air without masks.

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Artificial oxygen oasis in an otherwise CO2 atmosphere

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