Lungs
This is what Paris looks like when it snows - photo from MFAMB.
I drop Madeleine at school and jog home along the bus path which reminds me of some of the roadside runs in Ensenada or Mexicali where the diesel exhaust overwhelming. This morning no different. Unfortunately getting myself to the river adds three or four miles to a six-miler and just outside what I wish to do; otherwise it is all concrete and rubber.
A quick Internet search suggests that the exposure to micro particles, while jogging, from increased lung-air volumes negates the healthful benefits of exercise, raising the odds of respiratory infection and cancer. Sure feels like it now.