Interesting concept. Taking the Co2 theory one step further. The Navy experimented and designed the first Co2 "attractant" devices that are now marketed for home use with a propane tank. The mosquitos are attracted to our Co2 that we expel when we breathe, so these devices create Co2, attract the skeeters, and they are trapped inside and die. This "Kite" eliminates or masks our Co2 "scent" to them and so they avoid us. Very interesting theory. Rather than repel them, just cloak us so they don't "see" us.
A few years ago there was a "green" product called Bugs Bands. These were little rubber bracelets that were impregnated with a natural citronella based repellant. They worked OK, but faded after a few days of use.