As a response to a comment on my Australia Day post by Grandmére Mimi.
The Blue Mountains is densely populated by oil bearing Eucalyptus trees. The atmosphere is filled with finely dispersed droplets of oil, which, in combination with dust particles and water vapour, scatter short-wave length rays of light which are predominantly blue in colour.
C.T. Reflection on GAFCON Invasion of Britain
54 minutes ago