Firefighters have been called to a chemical incident in Harlow, Essex.
One woman has been treated with oxygen at the scene in a garage on Long Ley, in the town.
A decontamination zone has been set up and the woman has now been transferred to Princess Alexander Hospital.
Fire crews went to the garage at 0658 BST after reports of a strong smell of chemicals. Firefighters wearing gas tight suits investigated and called in a specialist hazardous area team.
"We are trying to ascertain whether there was a chemical involved and if so what type," incident commander Matt Hughes said.
"The casualty was our first priority. Crews carried out a snatch rescue to save her life and she has been removed to hospital."
A vehicle and garage block have been searched and police remain at the scene.