http://www.sciencemag.org/news/2017/01/brain-pollution-evidence-builds-dirty-air-causes-alzheimer-s-dementia
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4414870/
I think I will be mall walking for the next few days, rather than riding my bike on the bike path. Put "small particulate brain damage" into google, only go a small ways to be educated to the real dangers of breathing outside air today.
I give the RG a pass on this, kind of, as they also need to publicize the Duck's game, where many thousands will stand and cheer, and inhale, for hours. 
Not sure it is safe for a kid to run around in 99 degree weather with smoke pollution. But then, football...
Hugh Massengill, Eugene Oregon