Authorities said at a Sunday news conference 2,700 air samples were tested and none have exceeded levels to cause concern. Residents around the accident site have reported a gasoline smell. Officials say the spilled product can be hazardous.
Friday's accident near Bayport, Texas, between a tanker that punctured storage tanks on a tugboat pushing two barges along the Houston Ship Channel released 9,000 barrels of a gasoline blend stock.
Crews are working to remove the gasoline product from the barges. The ship channel remains partially closed. The cause of the collision is being investigated.