When the lump on her toddlers tummy turned out to be a rare cancer, Carla Hernandez wondered if living just a half-mile from two rail yards emitting a constant veil of near-invisible pollution was somehow responsible. “When she was diagnosed they kept asking me if I smoked or if anyone smoked around her, but no one did,” said Hernandez, sitting beside her 4-year-old daughter, who was sleeping after her latest treatment at Childrens Hospital Los Angeles.
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