Artificial turfs are not toxic. Artificial lawn is made of plastic materials which are found in every garden and home. You should of course make sure the artificial lawn is distributed by a recognized company which uses the strictest standards.
Another point to think of – unlike natural lawns, artificial lawns do not require pesticides or fertilizers. These substances can in many cases be more toxic and dangerous to children and animals. Artificial lawn does not attract insects and does not necessitate any pesticide.