Hazy skies and low air quality returned to the five boroughs on Monday, as smoke from Canadian wildfires again created a gray scene in the New York skies.

All of New York state and almost all of New England was under an air quality alert from the National Weather Service on Monday afternoon. The warning for New York City extended until midnight.

“Air quality is unhealthy for sensitive groups , including older adults, children, and people with heart or lung conditions,” NYC’s emergency department wrote on social media. “You may notice a faint smell of smoke, and low visibility conditions.”

It has become a depressingly familiar story for New Yorkers in recent years. Smoke from uncontrolled wildfires in Canada , most of them in the province of Manitoba, has been carried south and e

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