Environmental factors like pollution, particularly particulate matter and noise pollution, have been found to impact fertility in men and women. A recent study in Denmark found that long-term exposure to PM2.5 particulate matter increased the risk of infertility in men aged 30-45, while noise pollution increased the risk of infertility in women over 35. The study did not find a direct link between particulate matter and infertility in women. The researchers suggest that policies targeting air and noise pollution could be important in improving birth rates in Western countries. However, the study was observational and had limitations regarding lifestyle factors and specific exposures.
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