Swarms of mosquitoes emerge later in summer season after May drought, June’s heavy rainfall

Northwest Mosquito Abatement Assistant Director and Entomologist Patrick Irwin explains how one type of mosquito trap is meant to catch culex pipiens, a species of mosquito that can carry the West Nile virus, on July 14, 2021, at the Northwest Mosquito Abatement lab in Wheeling, Illinois. (Erin Hooley / Chicago Tribune)