[header] How to kill mosquitoes [title] Find a large box fan. [step] You can purchase a high-volume fan which sucks air in rather than out when compared to traditional fans from a home improvement store or a department store. Choose one with a metal frame, since you'll be using magnets in this trap. 
With this and a few other supplies, you can create a trap that will reduce the number of mosquitoes around at least in the short term. Its effect on long-term populations is unknown, but following the advice in the breeding prevention section as well is recommended.