Canada has many forest fires. Experts count over 800 fires. Over 100 fires are out of control. The fires are far from big cities. The wind blows smoke far away.
The air in Toronto is very bad. The air quality is the worst in the world. New York has much smoke too. The sky looks dark and gray.
Officials give warnings. People should not do sports outside. Cities cancel parties because of bad air. A big football game is cancelled too.
Experts say: Heat makes fires worse. Climate change causes this more often. Cities must prepare for this in the future. The smoke can stay for a few days.
