What about people who work in their yards regularly - are they at risk?
It is safe to play, garden, and grow fruits and vegetables in your yard.
Please keep in mind, current research recommends hand washing after play or contact with urban soils where concentrations of contaminants maybe higher than soils in rural areas. In addition, all fruits and vegetables should be thoroughly washed prior to consumption.
Please see this EPA Guide to Growing Gardens in Urban Soils for more information to grow plants and reduce exposure in mildly contaminated soil.