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RANCHO MIRAGE, CALIF. -- Air pollution worsens sperm quality, Dr. Rebecca Z. Sokol said at the annual meeting of the Pacific Coast Reproductive Society.
For every one-standard-deviation increase of 10 parts per million in air sulfate levels or ozone levels 70 days before semen collection, average sperm counts of around 85 million per cubic centimeter decreased by 1 million sperm per cubic centimeter in a retrospective study. Total motile sperm concentrations dropped significantly as well, said Dr. Sokol, professor of ob.gyn. and medicine at the University of Southern California, Los Angeles.
Sperm counts also declined with increasing levels of ozone in the air 10 days before semen collection.
Male-factor infertility is responsible for about half of all infertility cases. A million fewer sperm per cubic centimeter would not make much difference in a man with a healthy sperm count but could mean trouble for a man with low sperm counts who is trying to get his partner pregnant, she said.
A retrospective analysis of 7,341 semen donations made over a 2-year period by 48 men in Los Angeles and 25 men in Palo Alto, Calif., ...
Source: HighBeam Research, Air pollution may impair sperm number, quality. (Retrospective...