These Norfolk Island Pines Trees were healthy 18 months ago

Look at them now. Dropping needles.
They are in a reticulated park so it cannot be drought stress.

This is how they should look.
These ones are less than a kilometre away

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Picklebobble2 · 56-60, M

I wonder if that's a parasitic thing.

Bugs; mould spores blown in on the wind.

Something called ash dieback is affecting trees in the UK

Gusman · 61-69, M

I done a bit of research and it appears that the culprit is the fungal disease Neofusicoccum parvum, colloquially known as the "top-down" disease because it kills the branches at the top of the tree first.
This is occurring all along the Perth coastal suburbs.
As well as the east coast - Sydney/Brisbane and the rest.
Nothing can be done to save the trees.
They will all be removed eventually and new ones planted