There are a lot of people and a lot of organizations altering their outdoor schedules this year because of the perceived fear of smoke.
But if it does come, that fear is real and substantiated.
Animation courtesy of American Lung Association.
Watch part 1 here.
Watch part 2 here.
AP / file photoThe sun sets behind smoke from the Taylor Creek Fire in 2018, one in a series of smoky summers in the Rogue Valley.