PAULSBORO, N.J. (CBS) -- The mystery of the strange, strong odor that overwhelmed parts of South Jersey on Wednesday afternoon has been solved. A hazmat situation was declared in Gloucester County after officials say a rotten egg smell was reported. Gloucester County officials say the odor came from a tractor-trailer at a truck stop in East Greenwich. They say a trailer containing about 7,000 gallons of a chemical called Lubrizol was venting and causing the smell. It is not a natural gas leak. Gloucester County hazmat and emergency operations were on the scene, as well as multiple fire departments. New Jersey environmental...