Emergency services were called to the academy at around 12.30pm today (Wednesday 11 November), after a number of pupils were reported to had collapsed.
Two people were subsequently taken to hospital and then discharged.
A spokeswoman from the North Yorkshire Fire and Rescue Service said:
Investigations have been carried out by the specialist detection, identification and monitoring (DIM) team from West Yorkshire Fire and Rescue Service along with the specialist hazardous material officers from North Yorkshire Fire and Rescue Service and no hazardous chemicals or gasses have been found within the school.
Fire service crews have deemed the academy safe and have now left scene.
Superintendent Nick Hunter at North Yorkshire Police, said:
In cases like this where we have such a high number of people fall ill in such a small environment, it is our responsibility to take this extremely seriously and ensure a multi-agency response to fully investigate the circumstances.
The safety of all involved is paramount and we will take all necessary measures to ensure everyone’s safety.
Thankfully in this case, it was nothing serious and the incident has been brought to a safe conclusion.
Mike Shanahan, Head of Special Operations at Yorkshire Ambulance Service NHS Trust, added:
Our staff and specialist resources were able to provide effective care and treatment for the large number of patients on scene and liaised closely with the wider NHS services in the area. We are pleased that everyone has now been able to return to their homes and that our contribution, coupled with the collaborative approach with the head teacher and police and fire service colleagues, helped to ensure that the incident was well-managed and resulted in a safe outcome.
Thanks go to our staff and emergency service colleagues for their valued assistance today.
Sir Michael Wilkins, Academy Principal & Chief Executive of Outwood Grange Academies Trust, said:
The safety of our students is always the most important thing for us to consider in these circumstances and we were happy to follow the emergency services direction whilst they established that no students were at risk.
We would like to take this opportunity to thank the emergency services and parents and carers for their understanding. The academy will open as normal in the morning.