We recommend everyone stay indoors when possible.
Unfortunately, with an offshore flow expected, smoke concentrations will increase along coastal regions, including the Lower Mainland.
The National Weather Service is warning of dense smoke from wildfires across the region being pushed into the Yakima and Kittitas valleys by northerly winds.
"A mask is only going to clear smoke for you if it's fitted correctly".
"Wildfire smoke is a natural part of our environment but it is important to be mindful that exposure to smoke may affect your health".
The agency forecasts its air-quality index, which measures levels of the most harmful particulate matter in the air, to reach 151 in the Seattle area on Monday, well into the unhealthy category by federal standards.
Benenati said yellow emojis can be concerning to people who have asthma. A planned burn was carried out on the fire's southern edge on Sunday, which officials said would help ensure that the flames would not spread any farther in that direction.
Another notable fire, the 633-hectare Gottfriedsen Mountain fire, was brought under control on Sunday.
As dozens of wildfires continue to grow in western and central Canada, some towns have been shrouded in smoke so thick, the skies have turned black in the middle of the day. Residents of the town about 325 miles north of Vancouver posted images to social media in the morning hours, long after sunrise, to show the world what their city looks like.