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Ultra-Low Volume (ULV) Spraying for adult mosquitoes is normally done with a synthetic pyrethroid insecticide, permethrin. Permethrin is in a group of insecticides which are man-made versions of a natural insecticide derived from a type of chrysanthemum. Permethrin is one of the "least-toxic" products registered with the U.S. EPA for adult mosquito fogging.
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Repellents containing 10%-30% DEET (N,N-diethyl-meta-toluamide) are widely regarded as the most effective against mosquitoes.
Ultra-Low volume (ULV) fogging for adult mosquitoes is based on surveillance data gathered from a network of traps that monitor adult mosquito population levels and the presence of mosquito-borne diseases. Calls from residents concerning mosquito annoyance problems also help us to pinpoint "hot-spot" areas.
When our temperature is high enough for mosquitoes to breed and when we have a significant amount of mosquitoes flying around.
There is a lot you can do. Please visit this Personal Protection Page for more information