Firefighters responded Tuesday afternoon to reports of a fire at a refinery in Martinez. Contra Costa Health service said there were several reports of a fire at Martinez Refining Company with light smoke coming from the area. The refinery said in a Facebook post that on-site firefighters responded around noon to smoldering material in out-of-service equipment. The company said there were no injuries and there have been no impact operations at the refinery. The health department said a county hazmat team concluded air monitoring of the situation and that no threat to public health was detected throughout the incident.