Car-Jacking Human Fertility?

The School of Medicine of Tongji University, Shanghai studied almost 34,000 men, with an average age of 34, from 340 Chinese cities. The wives of their subjects, had become pregnant, using assisted reproduction technology with their sperm, between January 2013 and December 2019 (https://www.theguardian.com/environment/2022/feb/17/air-pollution-may-affect-sperm-quality-says-study). A link was found between the men's sperm mobility and the air pollution to which they were exposed in their home cities. Air pollution is, of course, produced by combinations of industrial processes and emissions from vehicles as well as home heating. Sperm mobility (the ability to swim) handicaps the male gametes in their 'race' towards an egg in the uterus. The smaller the size of the polluting particles, the greater their apparent effect on semen quality. The study strongly suggests that air pollution, in addition to its other 'crimes', damages human fertility.