How to mosquito proof mesh a pergola?

We have a concrete patio with an area of rocks that has plants in pots sitting on it.
I would like for my husband to build a pergola over it to provide shade in the heat of the day but alow the rain to water the plants. He wants to be able to enjoy it without needing a blood transfusion from the mosquitoes.
Any ideas?
Looking west. The plants now sit on the rocks, which slows more room on the patio.
Facing east
Again looking west while the plants were still located on the patio.
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