You can also try a simple fan blowing over the sitting areas, mosquitos (and other bugs) have difficulty flying in the breeze. I sometimes bring a small fan camping since the breeze is nice and I hate applying deet.
At home though, I use Thermacell. It's the only thing I have ever used that makes a measurable difference. Of course, you need to have one ever four or five feet unless the air is perfectly still but that's a small price.
I keep bottles and sachets of OFF's DEEP WOODS DEET fueled repellant in my car, book bags, its a must-have.
"Their mouthparts include two pairs of cutting "blades" that lacerate skin and cause flow of blood out of the wound, which females lap up with a sponge-like mouthpart."
https://extension.entm.purdue.edu/publichealth/insects/taban...
(If you find that a fan works, that's even better! But I never really find these environmental interventions are good enough, they always get me at some point regardless)
The problem, of course, is that the path of a fan is huge and how many fans are you really going to have around?
Same with incense-style repellents, I'm pretty convinced they reduce the number of mosquitoes but eventually one will be attracted to me via some path where the repellent isn't currently flowing and I'll get bitten regardless. (I think that smoke is also probably pretty bad for you if you use it a lot, too).
And since the difference between one bite and zero bites is a really big deal I usually just go for on-skin repellents.
For fans, I have seen people make mosquito traps by attaching a bug net to a fan, sometimes combined with a CO2 generator as bait. I don't know how effective it is in practice. What we do sometimes is to put a fan under the table, it helps a little against low flying mosquitoes, definitely not as effective as DEET though.