The Hazardous Materials team was called to investigate a possible gas leak at Pape station on Friday morning.
It turned out to be a sewage issue, TTC spokesperson Milly Bernal told CityNews.
Two TTC workers had complained of chest pains.
They had been working near an area known as the “pit,” which is surrounded by signs warning of the dangers of lethal gases.
The workers were taken to hospital to be examined.
Morning service was not affected.