MISSISSUGA, Ont. – Two floors of the Hilton Garden Inn in Mississauga had to be evacuated Monday morning, after what police said was an employee mistake while mixing swimming pool chemicals.

TheStar.com said the incident happened just after 8 a.m.at the building located on Traders Boulevard.

The hotel’s air quality is being monitored until it returns to normal.

A Mississauga Transit bus was sent to the hotel to accommodate guests who were forced to leave.