While Canadian officials expanded evacuation orders and asked other countries for help fighting more than 420 fires nationwide, air quality with what the U.S. rates as “hazardous” levels of pollution extended into central New York, with massive tongues of “unhealthy” air extending as far as Virginia and Indiana.

In Baltimore, where officials warned residents to stay indoors when possible and limit outdoor exertion, Debbie Funk sported a blue surgical mask as she and husband Jack Hughes took their daily walk around Fort McHenry, a national monument overlooking the Patapsco River. The air hung thick over the water, obscuring the horizon as distant ships pushed slowly through the haze.

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“I walked outside this morning and it was like a waft of smoke,” said Funk, who said the couple had considered skipping the walk but wanted some exercise. The two planned to stay inside later Wednesday.

Read more: Breitbart