I work in mosquito control. You aren't imagining it.

I'm new to the field but the guy I work with has done it since the early 80's and used to drive those trucks.

The way he tells it though people used to open up their windows when they heard the truck coming so the chemicals would come inside and kills the mosquitos that already made it in the house 🤣

The residential truck spraying isn't done any more though, for obvious reasons. Where I'm from it's just larval mosquito control, using bacteria that only kills mosquito larvae in the wayer. In the states they fly planes overhead and fog agricultural fields and whatnot. Killing all the mosquitos and bees and shit which may be pollinating the crops.