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flag Wildfire smoke exposure in Seattle linked to lower sperm quality in men, per a UW study.

flag A University of Washington study links wildfire smoke exposure to reduced sperm quality in men, finding lower sperm concentration, count, and motility during major smoke events in Seattle between 2018 and 2022. flag Researchers analyzed semen samples from 84 men undergoing fertility treatment, noting consistent declines during high-smoke years. flag While one motility measure slightly increased, it did not offset overall reductions. flag The study, published in Fertility and Sterility, adds to evidence that air pollution affects reproductive health, though it did not assess fertility outcomes or recovery timelines. flag A follow-up study is underway to examine how quickly sperm quality may rebound after exposure.

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