Pesticides can be tracked into the home up to a week after they're
applied.
Precautions like putting a mat in the entrance hall or taking off your
shoes will limit chemical residue
The EPA classifies 2,4-D -- the most widely used weed killer worldwide as a low to moderately toxic herbicide.
Conclusion:
A green, healthy lawn looks nice, but pesticides are not something a
homeowner should take lightly.