Why hasn't the Parisian sky been completely blue for several days?

You may have noticed that for several days now, despite the lovely weather and heat reigning in the capital, the sky isn't absolutely clear blue. On the contrary, it seems to be covered by a light veil between white and gray. This phenomenon is explained in part by the many wildfires happening across the Atlantic.

Canada as the main culprit

Yes, a fire happening in Canada can have an impact all the way to France. As meteorologist Guillaume Séchet mentions in a post on social network X, the Parisian sky is veiled by the “« smoke from Canadian wildfires that blanket a good part of France ». Currently, 665 fires sThere are active fires in Canada, including 146 controlled, 53 contained, and 466 uncontrolled. According to the radar from Radio-Canada, updated daily, 2025 is the worst season ever observed in Canada, with 6.5 million hectares of forest burned recorded on August 4th. The jet stream is particularly dynamic—reaching speeds of up to 250 km/h as noted by Meteo-Paris—allowing particles from the smoke of Canadian fires to cross the Atlantic and reach France. 

Ce soir, alors que le ciel est censé être totalement dégagé, la lumière rasante du coucher du soleil met en évidence la présence des #fumées des #incendies canadiens qui survolent une bonne partie de la France (dont #Paris) - après avoir traversé le Nord de l'Atlantique...… pic.twitter.com/cGeoOXn0rf

— Guillaume Séchet (@Meteovilles) August 10, 2025