Unusually high humidity is contributing to a rise in mosquitoes across Southern California, and health officials say that is also contributing to more West Nile virus cases. Los Angeles County has now confirmed 100 cases, the highest number in about a decade. The region experienced a hotter-than-usual summer, including its first major heat wave of the year back in March. Experts say El Niño conditions are bringing more moisture into Southern California, creating conditions that can support larger mosquito populations. Increased moisture is also being linked to more tropical activity in the Pacific, sending additional humidity into the region. Officials warn that conditions could become even more favorable for mosquitoes in the coming days, with Hurricane Polo moving north from off the coast of Mexico. Residents are being urged to protect themselves by using insect repellent, wearing long sleeves when possible and removing standing water around homes, where mosquitoes can breed. Health officials say reducing mosquito exposure remains important as cases continue to rise.
