Car pollution affects male fertility
Symbol of virility for the unskilled dredgers, the car could ultimately prove to be more harmful than beneficial for the fertility of men. According to an Italian study, automobile pollution affects the quality of sperm. The team of Dr. Michele De Rosa examined the sperm quality of 85 men working at toll gates and therefore exposed 6 hours a day to exhaust gases. When comparing these samples to those of men living in the same area, they did not observe any differences in the amount of sperm, the levels of certain hormones that affect sperm production, or the male sex hormones. But the parameters relating to the quality of the sperm were significantly lower in the toll workers and even lower than the standards defined by the World Health Organization. Further analyzes have shown that nitrous oxides and lead are the most dangerous substances. There is thus an inverse correlation between the number of spermatozoa and the concentration of lead in the blood (blood lead level), and the other qualitative parameters were inversely correlated with the level of methemoglobin, marker of the concentration of nitrogen protoxides. "Our study shows that continued exposure to automobile pollution affects the quality of sperm in young and middle-aged men" conclude the authors. The latter call for further epidemiological studies and fertility assessments in men who have left their jobs at the toll station to determine whether the deleterious action of these substances is reversible.
Source: Hum. Reprod. 2003 18: 1055-1061
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