The health advisory had been issued for the area surrounding the refinery at 1380 San Pablo Ave. this morning in response to reports of a fire there shortly after 1 a.m., Randy Sawyer, the county's chief environmental health and hazardous materials officer said.
A fire in the refinery could potentially put hazardous materials in the air, potentially exacerbating health problems for those with preexisting respiratory conditions such as asthma or emphysema.
However, Contra Costa Hazardous Materials crews in the area reported no chemicals in the air, and declared the situation all clear.
The extent of the fire or any damages is not clear. Neither the Rodeo-Hercules Fire District nor the Contra Costa County Fire Protection District responded to the fire. A Contra Costa County fire dispatcher said that the refinery was handling the incident internally.
Officials at ConocoPhillips declined to comment.