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Wildfire smoke now bigger prenatal threat than human sources of air pollution
野火烟雾正成为孕期空气污染头号威胁，环保法规的成果被悄然吞噬。
Regulations reduced prenatal exposure to harmful emissions, but wildfire smoke is erasing gains.
野火烟雾正成为孕期空气污染头号威胁，环保法规的成果被悄然吞噬。
Regulations reduced prenatal exposure to harmful emissions, but wildfire smoke is erasing gains.