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........“Literally no amount of exposure is safe,” said Marshall Burke, an associate professor of earth system science who led the project for Stanford University. Emerging research shows wildfire smoke exposure not only negatively impacts the heart and lungs but also the brain. Smoke exposure also poses pregnancy risks. Children and older people are most vulnerable. “There's no magic threshold under which we're OK and beyond which we're in trouble. The lesson is that any amount is bad. And the more you get the worse it is.”......