The LA County Sheriff's Dept. tells us that the smoke you've been breathing this afternoon comes from a brush fire in East LA.  They sent this message this afternoon:

The Los Angeles County Sheriff's Department in conjunction with The Los Angeles County Fire Department advise you to AVOID traveling on Eastern Avenue between City Terrace Drive and North Marianna Avenue in the community of East Los Angeles due to a brush fire that threatened several residential homes in the area.

The ten acre brush fire on the hill just west of Eastern Avenue near North Marianna Avenue has been extinguished stated Inspector LeVesque of the Los Angeles County Fire Department.

Currently, there have been no reported injuries nor any reported property damage. However, the area still remains closed while the Los Angeles County Fire Department concludes it's operation.

This will require temporary road closure for approximately one more hour while the Fire Department inspects the hill for any potential hot spots that may re-ignite the hillside.