Photos show how smoke from Canada wildfires changed the view of America's monuments

Wildfires in Canada have caused hazy and hazardous air quality conditions across much of the United States.

Wind currents carrying smoke from Canada's wildfires — some which were ignited by lightning strikes coupled with unusually hot, dry weather — have temporarily upended life for many in the Northeast and Midwest. The low-pressure system adrift over Maine and Nova Scotia is likely the cause of poor air quality, which could linger through next week, according to experts.

Many events, including Major League Baseball games, and outdoor activities have been postponed or canceled due to the poor air quality conditions.

Before and after photos from across the nation highlight dramatic shifts in scenery.

Contributing: George Petras, Janet Loehrke, Stephen J. Beard, Javier Zarracina