How safe is the air you're breathing, and where is it coming from? Tune in to "Toxic America," a breathtaking special investigation, with Dr. Sanjay Gupta, Saturday at 8 p.m. ET on CNN. Five years ago Molly and Zachery Gray were in the midst of a dark, lonely spiral. It began with Molly's first miscarriage. "It was a really emotional process of being so joyful and so happy and ready to make that step into parenthood and that being pulled away from you," said Molly, 32. "[The pregnancy is] happening and all of a sudden it's gone. It's really hard." After a second miscarriage the Grays were on a desperate hunt for answers. After Molly got pregnant a third time, she heard about a small study to test the blood of pregnant women for chemicals. She signed up.

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