There are now more ‘mosquito disease days’ in 95% of major US cities: See the map

San Francisco recorded the largest rise with 52 extra mosquito disease days annually, while Santa Maria and Salinas also ranked among the highest. The results showed that 227 of the 239 cities analyzed, or 95%, experienced an increase in annual mosquito disease days since the early 1970s. On average, those cities now see 18 additional mosquito disease days each year. San Francisco topped the list with 52 more mosquito disease days annually, followed by Reno, Nevada, with 50 more days, Santa Maria, California, with 49, Albany, Georgia, with 41, and Salinas, California, with 40. Regionally, the Southeast, Northeast, and Northwest recorded the largest average gains, each adding approximately 20 mosquito disease days per year over the past five decades.