The council told the BBC developers were responsible until it was happy that "drainage, roads and footways are completed to a satisfactory standard for adoption".

In a joint statement, the NASUWT, INTO, UTU and NEU said that they had made it clear to Education Minister Paul Givan that "he needs to make a satisfactory offer on pay".

As per WHO, air with AQI values at or below 100 is considered to be satisfactory for breathing, while readings in the 400-500 range denote that pollution levels are "severe" in an area.

Without a satisfactory NHS Assure review, new health facilities are not allowed to open to the public.

He said the money for school buildings was "helpful" but that there was still "a significant shortfall in terms of what is needed to restore the school estate to a satisfactory condition".