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Live from ABC News headquarters in New York City. This is Good Morning America.

Lots of cities this morning. Good morning. America. Hope you all are doing well. Great to be here with Rebecca and Debra here in the studio. Sam, what's happening down there? Well, George, hi to everybody, first of all. And you know, Miami is a world-class cultural phenomenon. So I need you guys to get your hats, get your sunscreen, because I can't wait to throw you in the convertible and drive through these incredible neighborhoods. I want to show you the new Miami. That's Sam. We're looking forward to that. We're going to have more from you later. Also, you're going to break down this new headline on mortgage rates. Big changes for buyers and sellers coming up. First we begin with the smoke from Canadian wildfires, putting at least 10 states on alert right now. Yesterday, American cities like New York, Chicago, Endictroit ranked among the worst in the world in air quality. Extreme heat is fueling fires out west. Of course, ginger staying by to track that. Stephanie Ramos starts us off. Good morning, Stephanie. George, good morning. There are some hazy skies right now from the Great Lakes to the northeast.

The air quality here in New York City has improved a bit, but that smoky air from the Canadian wildfires is really impacting millions of people across the country.

Toxic smoke for more than 700 Canadian wildfires blanketing parts of the U.S. again, and some major cities are seeing some of the worst air quality in the world.

This is the haze hanging over New York City Tuesday.

Sounds like none of us should be outside right now.

Detroit, even worse, ranked fourth in the world for worst air quality.

You can barely see the buildings.

It's prompted local and state

leaders to call on Canada to do more in dealing with the wildfire battle this air

is especially tough on people who already have trouble breathing I always

recommend my asthmatics to carry their albuterol pump when the air quality is

bad and to have it on them because it can happen at any moment.

This could really affect people.

100%, especially if they're outside for greater than 30 minutes.

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