A 3-D printable Jar & + Lid and some method of attracting the mosquitoes into it, trapping & killing them.
The Jars could then be washed and reused. Could be applied anywhere these insects are a pest or a danger to the population. In extreme cases the jar could be upgraded to an aquarium with the same design concept.
Place multiple in an area and you could put a serious dent in the mosquito population.
What could be used to attract mosquitoes strongly enough that they would crawl inside the jar?
The two things that immediately pop into my head are chemical traces of either a food source or a potential mate. There are a number of mosquito lures that you can order as replacements for existing mosquito traps so that is where I'll start my research.