How much shade is needed

The Cancer Society of NZ (Inc) publication, Undercover, recommends a minimum of 2.5m 2 per student. As the schools surveyed were selected because they had shade structures it is not surprising that the quantity of shade ranged from 2.4m 2 to 54.2m 2. School grounds with ample shade generally had 'inherited' mature trees. Schools with minimum shade were located on confined city sites. It was observed that building shadow was not used for play. The south sides of school buildings are usually blank and cool.