According to rankings from pest control company Orkin, L.A. has unseated Atlanta, which held the top spot on that list for several years in a row.
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Rounding out the top five on that list were Washington D.C., Dallas and Chicago.
Three other cities on the West Coast also broke into the list this year: Seattle, San Diego and Fresno.
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Mosquitoes become more active when temperatures reach over 68 degrees, according to the company. Their breeding season can start as early as May and last through September.