Kayakers paddle through the Charles River against the smoke-obscured Boston skyline on May 31. Smoke from forest fires in Quebec drifted through Boston, making breathing uncomfortable outdoors.

Leah B. Brunetto

Kayakers paddle through the Charles River against the smoke-obscured Boston skyline on May 31. Smoke from forest fires in Quebec drifted through Boston, making breathing uncomfortable outdoors. Leah B. Brunetto