Canadian wildfire smoke has worsened the air quality in multiple states and irritated the eyes, noses and throats of many Americans.

Smoke from Canada’s raging wildfires has travelled over 5,000 kilometres across the Atlantic Ocean, reaching parts of Europe and blanketing cities with haze and black carbon. Over the past 24 hours, the eastern regions of the continent have reported hazy skies, prompting concerns about the far-reaching effects of wildfire emissions.

A thin veil of smoke from wildfires burning in Canada is worsening air quality and putting a lid on temperatures in the D.C. area. The smoke, which has resulted in some of the world’s worst air quality in the Upper Midwest and Northeast, is only wafting through the Mid-Atlantic in limited quantities, but it’s enough to have a small impact.