The model image below shows smoke in the area over Kentuckiana.
Unhealthy for Sensitive Groups: People with respiratory or heart disease, the elderly and children should limit prolonged exertion.
At times Wednesday night, Bellingham's air worsened to the "hazardous" range, the worst category, and visibility was less than 2 miles.
"Elite athletes will face difficulties breathing, some early exhaustion, and in extreme cases if they're also dehydrated, they may experience confusion from difficulty breathing the air", Corneil said.
While a special weather statement is still in effect for the Metro Vancouver region, the cooler temperatures and light rain have helped ease the smoke.
While we don't need NASA to tell us how bad the smoke is across B.C., these images taken from space demonstrate just how far it's travelled.
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In the Okanagan Valley, crews have been mainly mopping up following aggressive wildfires that broke out in early July, but a new fire has forced the Regional District of Okanagan-Similkameen to issue an evacuation alert northwest of Summerland.
But the reprieve may not last long.
Firefighters from Saskatchewan are working across B.C, though most are stationed near Fraser Lake to battle the province's largest fire. Officials said an increase in wildfire activity in southeastern B.C. was also a concern.
Smoke from distant wildfires is forcing residents in parts of the province to stay indoors, especially if they have pre-existing conditions such as asthma, and tourism is being affected where skies are hazy.
Seattle's Space Needle was swathed in haze on Monday, and it was impossible to see nearby mountains.
"Despite the fact it has been going on for several weeks, we really do see this as a short-term exposure compared to the day in, day out exposures that others have", said Henry.