On Sunday, March 11, a brush fire struck in the Anaheim Hills area. It was controlled relatively quickly, and by the next morning, the smoke had settled into a blanket of haze over Orange County.

For contrast, here’s a shot from a few weeks earlier (February 23), when it was unusually clear. This was taken from a park in the Quail Hill area of Irvine, looking across the Saddleback Valley from the south toward the same range of hills seen on the left of the picture above.