Listen
In the US, the Bootleg wildfire in Oregon has grown into a monstrous complex with its own weather system.
On the other side of the States, New York City has woken up to an intense red sunrise, the smell of wildfires and a thick brown haze.
New reports say lightning started the wildfire, which has become the third largest fire in the state's history.
The fire was named after the nearby Bootleg Spring.
Oregon Public Broadcasting science reporter Erin Ross spoke to Guyon Espiner.