Association of Exposure to Ambient Fine Particulate Matter Constituents With Semen Quality Among Men Attending a Fertility Center in China

Ambient fine particulate matter (PM₂.₅) exposure has been linked to decreased semen quality, but the associations between PM₂.₅ constituent exposures and semen qualityremain unknown. We enrolled 1081 men whose partners underwent assisted reproductive technologyprocedures in Wuhan, China in 2014–2015, and examined their semen quality. Daily average concentrations of PM₂.₅ constituents including 10 metals/ metalloidelements and 4 water-soluble ions were continuously determined for 1 week per month at 2 fixed monitoring stations. Linear mixed models were used to examine the associations of exposures to PM₂.₅ and its constituents with semen quality. Each interquartile range(36.5 μg/m³) increase in PM₂.₅ exposure was significantly associated with 8.5% (95% CI: 2.3%, 14.4%) and 8.1% (95% CI: 0.7%, 15.0%) decrease in sperm concentration and total sperm number, respectively. Antimony, cadmium, lead, manganese, and nickel exposures were significantly associated with decreased sperm concentration, whereas manganese exposure was also significantly associated with decreased total motility. Nonsmokers were more susceptible to PM₂.₅ constituent exposures, especially for antimonyand cadmium (all P for effect modification <0.05). These findings suggest that PM₂.₅ and certain constituents may adversely affect semen quality, especially sperm concentration, and provide new evidence to formulate pollution abatement strategies for male reproductive health.