One of the cities that will host the World Cup 2026 is Atlanta, Georgia.
Since the world cup will be in Atlanta, there is going to be a bunch of tourists, thousands probably even millions of people coming to the city. That means we've got 4 years to fix all crime, air pollution, and traffic. And the city of Atlanta will use a lot of money to fix these problems.
So there are benefits of the world cup being placed here in Atlanta. Atlanta has the opportunity to make electric transport so there wouldn't be to much air pollution. People just can't come and live in hotels rent free, they'll have to pay money to stay. They can't come and wait for the finals without eating, they have to go to restaurants and pay money to eat. So is that way Atlanta would have a lot of money, which they could use to fix some problems in Atlanta.
The cost of Hosting the world cup in Atlanta include more air pollution. Since a lot of tourist will come to the city or state they'll need to travel. Trains, Fuel Vehicles, and Buses causes a lot of pollution. And since Atlanta is known for traffic there's going to be more traffic and a lot of air pollution.
So know you know that there is costs and benefits in hosting a world cup. A benefit is that Atlanta would make money. A cost is air pollution which causes illness.