Emergency services have responded to a chemical incident at commercial premises in Christchurch.

A St John spokesperson told chrislynchmedia.com emergency services were notified of the incident on Coleridge Street in Sydenham at 3.50pm.

Two ambulances, a rapid response unit and an operations manager were dispatched to the scene.

Chris Lynch Media understands a person was found unconscious on site, while another person has suffered moderate injuries.

A police spokesperson told chrislynchmedia.com police had been notified of the incident but had not attended at the time of the response.

Police referred further enquiries to Fire and Emergency New Zealand.

Work Safe New Zealand has been approached for comment.