You probably want to do a soil test. Depending on what is in there, dust may be the bigger risk. As the other commenter said, you probably don’t need to worry about eating food grown in contaminated soil as long as you wash it thoroughly before eating. However, spending a lot of time working out there- breathing in particulates, getting dirt in your eyes, under your nails, and in all the little cuts one gets while working in a garden-could introduce something to your system you don’t want.

Abe Books was acquired by Amazon in 2008. Consider Alibris or Thrift books.