Air Pollution and Fetal Brains

My mother-in-law suggested that we move to a different city because ours has a high amount of air pollution. What could that possibly have to do with my pregnancy?

She may have read an article written by  Chia-Yi Hou and published this month in The Scientist. It describes studies with rodents in which researchers detected abnormal fetal development due, they believe, to air pollution. He cites data from the World Health Organization stating that 4.2 million deaths each year are related to air pollution. There are, of course, steps one can take if one lives in an area of high pollution including air filtration equipment in the home and wearing masks (e.g., N95) when going outdoors..

https://www.the-scientist.com/news-opinion/pregnant-moms-air-pollution-exposure-may-affect-babies-health-66467