In municipalities around the country, trucks patrol the streets with giant foggers to keep mosquito populations in check. It’s an especially important job in coastal areas where the blood-sucking insects thrive, and in some cases, specialized trucks have been doing this work for decades. Miami-Dade County has operated spraying trucks since 1935, while the Bristol County Mosquito Control Project in Massachusetts has been monitoring—and when necessary, eliminating—the insects since 1959. The trucks used for this job are ordinary pickups with large tanks of pesticides and automated sprayers in their beds. The streets of New Bedford, Massachusetts, get sprayed between 2 a.m. and 10 a.m., reports The New Bedford Light.