Grey Highlands OKs study of mould, air quality at Rocklyn arena Municipality temporarily closed arena in Rocklyn last month due to mould and air quality concerns Photo by suppliedArticle content Grey Highlands has moved ahead with a study to determine the extent of the mould and air quality problems at the Rocklyn Arena. Try refreshing your browser, or Grey Highlands OKs study of mould, air quality at Rocklyn arena Back to video We apologize, but this video has failed to load. The move came after Grey Highlands announced on July 17 the temporary closure of the arena in Rocklyn due to mould and indoor air quality concerns. A series of reports that were part of the meeting agenda covered air quality and mould issues discovered at the facility. The Rocklyn arena is part of the Euphrasia Memorial Community Centre at the junction of Grey Road 32 and the 7th Line.