Update: 7th Avenue is back open.
Update: According to an email sent to students, a contractor was working on the HVAC system in the Old Main building.
A refrigerant leak occurred causing a fog that has been determined to be non-toxic.
The building is closed for the rest of the day and all classes in that building are cancelled for the day.
Original Story:The Rock Island Fire Department is currently on scene at Augustana College.
7th avenue has also been shut down between 35th and 38th streets.
Crews have not said why they are on scene.
Local 4 News has on location and will provide details as sson as they become available.