Smoke from wildfires in British Columbia (BC) has made the air quality in parts of the Canadian province among the worst in the world.
"The millions of vehicles on Bay Area roads during these hot summer months create unhealthy air quality and make breathing more hard for many", said Jack Broadbent, executive officer of the air district.
Henderson said testing had shown levels of fine particulate matter of up to 200 parts per million in some B.C. communities. Children and the elderly should avoid outdoor physical activity altogether.
As of late Monday morning, northeast and northwest sections of Metro Vancouver reported an AQHI past the upper threshold of 10, indicating a very high health risk.
But Steve Weston, head coach of the Vancouver Athletic Football Club, said all the parents opted to let their kids play.
"The levels we measured at Hope over the weekend, from what we can tell... are, I think, the highest wildfire smoke levels we've measured certainly in the last few years", he says.
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The afternoon camp for older players was cancelled, however, because the focus is on team training, fitness and agility.
About 2,200 evacuees have ended up in Prince George, where some people said they were sleeping in their vehicles until other shelter could be found.
The entire province of Manitoba is under somewhat hazy skies and Environment Canada has issued an air quality alert.
Meanwhile, thousands of kilometres to the southeast, 4,500 residents of Kimberley, B.C., have been on an evacuation alert since Thursday as smoke continues to descend on the East Kootenay region.
"Using an air conditioner that cools and filters air may help", stated the advisory. "If your home isn't air-conditioned, consider going to a public place (library, shopping mall, recreation centre) that is air-conditioned".