A report out of Lanzhou, China, said that PM2.5 carbon ultrafine particles or nanoparticles can cause a 70% chance of miscarriage among first pregnancies.
This is according to a doctoral study at the radiological chemistry and nuclear environment research institute of the school of science and technology of Lanzhou University.
Isotope tracing technology was used to trace a carbon nanoparticle through the placenta wall. The test was done on mice to observe the effect of carbon nanoparticles on pregnancy.
According to the study, after the ultrafine carbon particle or carbon nanoparticle enters the body of the fetus, the progesterone secretion drops and pregnanediol secretion increases. The number of blood vessels inside the placenta lessens and the diameter of the blood vessels become narrower. The ability of the mother to sustain the fetus is weakened, and the development of the tissue of the brain and the heart of the fetus slows. This will result in still birth and miscarriage.
Ultrafine particles of carbon such as PM2.5 can cause a 70% chance of miscarriage among first pregnancies, the study concluded.
I would think that any pregnant mother who inhales several hundred micrograms/cubic meter of PM2.5 for several hours every day for more than half of the number of days of every month would be severely affected and her unborn child would be severely affected as well.