Thirteen people have been transported to hospital following a chemical release at Mayfield West this morning.
Just before 8am, NSW Ambulance and Fire and Rescue crews were called to the Modulate Containers site on Woodstock Street to reports of workers being exposed to a chemical believed to be Napthalene.
Fire crews have not confirmed the chemical and are listing it as an unknown chemical gas or fume.
The source of the release is yet to be identified but it's not believed to have originated on the Modulate Containers site.
Paramedics say a man in his 50s was taken to the Mater Hospital suffering nausea and a burning sensation in his throat, 12 other patients have since been taken to the Mater and John Hunter Hospitals suffering various levels of nausea and headaches.
All patients are in a stable condition.
A Fire and Rescue HAZMAT team was called to the scene from the Central Coast and crews remain on site to monitor the chemical's spread.
