New York City, Long Island and the Hudson Valley will all experience air quality within the 101-150 range on the air quality index Sunday, the state’s Department of Environmental Conservation forecasted—meaning the air could contain fine particles and could be “unhealthy for sensitive groups.”

New York City’s air quality has dropped to unhealthy levels for sensitive groups as smoke from Canadian wildfires drifts into the region, prompting officials to extend an air-quality alert through the weekend.

Toronto had the second worst air quality in the world next to New York Friday morning, according to IQAir’s rankings. The city remains under a Environment Canada special air quality statement.