Air quality warnings have been issued for much of B.C.’s South Coast, where smoke wafting from wildfires on both sides of the Canada-U.S. border has created hazy skies.

Elevated levels of fine particulate matter have been detected across Metro Vancouver and the Fraser Valley as a result, creating a risk of negative health effects.

The conditions are expected to last “a few days, or until there is a change in the weather,” according to a notice posted on the Metro Vancouver Regional District website on Wednesday.

As of the early afternoon, the smoke had pushed Vancouver to the top of a “most-polluted major city” ranking from IQAir, a Swiss company that develops air quality monitoring systems.

Behind Vancouver were the cities of Kinshasa, Democratic Republic of the Congo, and Lahore, Pakistan.