Edmonton researcher and soccer ref develops guidelines for when it's too smoky to play outside

Two years ago, when most of Alberta lay under a thick cloud of smoke from the Fort McMurray wildfire, a question crossed Richard Dixon’s mind.
An environmental policy researcher and sometimes youth soccer referee, he wondered: how much smoke is too much when it comes to outdoor exercise?
“We had situations two years ago when air quality was 10-plus (on the air quality health index), and people were trying to keep their kids on the field,” said Dixon. “And that’s put