Wildfire smoke moving into the region has prompted Metro Vancouver to issue an air quality advisory for the area as well as the Fraser Valley.
Wildfires burning in Washington state and British Columbia are causing high concentrations of fine particulate matter to move in.
Metro Vancouver said smoke concentrations can vary widely across the region depending on winds and temperatures.
On Saturday, the regional district cancelled a previous air quality advisory after some clean marine air swept through clearing last week's smoke away. But a different weather pattern moved in with northwest winds and by late Sunday smoke was being measured throughout the region, said a Metro Vancouver release. It also warned elevated levels of fine particulate matter are expected to persist until there is a change in the fire and/or weather conditions.
The release said particulate matter can easily penetrate indoors because of its small size.
Those with chronic underlying medical conditions should postpone strenuous exercise until the advisory is lifted. Of particular concern, said the release, is exposure for infants, the elderly and those with diabetes, and lung or heart disease.
