On Android there are probably several applications like this one:
(the link should give the English version)
I guess it should be trivial to use a command line one-liner to make audio play sounds on the frequencies repelling mosquitos. True? Is it easy to do with L5?
Crickets also help. So to mimic crickets may be another interesting and not so annoying option.
Well, if the apparatus is designed for human senses, logic dictates it can be used to distract, repel and/or connect humans. Mosquitos are attracted mostly by smells according to studies, so, if L5 would have a feature or a connected device to manipulate smells (around or of the user), that might work (maybe in Fir? Internet of Smells, anyone?). In the mean time, using L5 to play classical music may work best repelling teenagers. Using L5 to slap the little sh*ts (mosquitos) to repel them has not been studied but is not advisable.
Eucalyptus is not. But the products labeled as “oil of lemon eucalyptus” are enhanced with a lab produced chemical which exists naturally in lemon eucalyptus but not at the desirable level. So I am not sure what the word “chemical” means…