I can not say anything about this incident, but what I have noticed in the last some years is that mosquitos have become much more annoying even in larger cities of mediate temperature. That has not been the case say 30 years up to 10 years ago or so, give or take. The range of mosquito attacks has definitely increased in every axis. Kind of almost miniature mosquitos too - really small, like barely 0.5 cm at max in length or perhaps 0.6 cm, but annoying to no ends and very hungry for blood. One can speculate but I think the increased temperature range induced this for the most part.