Public and commercial spray operators are required to give advance notice of spraying to registered individuals. In addition, the Chester County Health Department grants registered hypersensitive individuals an exclusion zone around their residence to spare them from chemical exposure.
If you feel you qualify, to register you can download the form here: Pesticide Hypersensitivity Application Form(2). Then print and fill it out, get a physician’s signed approval, and submit it.
Background info at Penn State Extension includes:
“The Pennsylvania Department of Agriculture (PDA) maintains a registry of individuals hypersensitive to pesticides. It is a listing of locations for people who have been verified by a physician to be excessively or abnormally sensitive to pesticides. These hypersensitive individuals may request to have listings of their home, place of employment, school (if a student), and vacation home placed in the Registry. A person will not be considered included in the Registry unless their name appears in the current published Registry.”
Note that you can register not just your home address but up to 4 locations.