The all clear has been given at Algonquin College after a building was evacuated Wednesday afternoon when one woman fainted and several other people reported feeling unwell.
Paramedics said they were called at 1:54 p.m. to building V at the college, off Woodroffe Avenue, after six people reported feeling light-headed and ill.
The building was evacuated and the fire department's hazardous materials team was called in to investigate.
A 19-year-old woman was taken to hospital feeling "generally unwell" with no specific symptoms, paramedics said. Five other people who also felt unwell refused assessments by paramedics.
About 80 people were quarantined outside of the building while fire crews investigated. The quarantine has since been lifted.
Building V houses the college's animal health care facility.
Initial air quality tests in the building revealed nothing unusual, said college vice-president Gerry Barker.
Later on, the fire department said nothing unusual was found and that crews were in the process of leaving the scene.