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The White House is completing its interagency review of the Environmental Protection Agency’s updated ground-level ozone standard to protect public health. This will be the first improvement in the standard, which sets a protective, health-based limit to ozone levels in the air we breathe, since 1997. By law the new standard must reflect the latest science, which includes a better understanding of the impact that ozone has on the lungs and hearts of children, seniors, those suffering from respiratory ailments, and healthy adults as well. . .