Several states offer coloring books for youth in order to provide education about indoor as part of their outreach mission. Some are:
UTAH
Utah Department of Environment Protection
The Utah coloring book was created by a previous poster contest winner (Kyler, age 9, winner in 2017) who used his prize money to create the coloring book.
See: https://documents.deq.utah.gov/communication-office/radon/kylers-coloring-book-pages-1-10.pdf
KENTUCKY
Kentucky offers a coloring book created by the University of Kentucky at https://www.uky.edu/breathe/sites/breathe.uky.edu/files/Radon_Coloring_Book_KY_FINAL.pdf
COLORADO
Colorado State University Extension Service provides a coloring book at https://extension.colostate.edu/docs/pubs/consumer/healthy-home-activity.pdf
WEST VIRGINIA
West Virginia Department of Health and Human Resources coloring book is available at
United States