A wildfire in California has been burning for almost two weeks, and 3,700 firefighters are battling day and night trying to contain it.
Known as the Rim Fire, it covers an area of around 288 square miles - about the size of Edinburgh in Scotland.
In the past few days the fires have hit the outskirts of the Yosemite National Park, where some of the world's oldest trees are under threat.
A reservoir that supplies water to San Francisco has been covered in ash.
Many people have had to leave their homes and some houses have been destroyed.
It started on 17 August but nobody knows how.
August is fourteen and lives close to what's happening - watch the video to see how it's affecting him.