Long Needle Pine Tree

Question

The park I walk in every day has these Pine trees. One tree is all brown, several others are going brown. In the park are small Oak trees, which look sick. The tree trunks look mosaic.

Answer 1

Here are links with more information.
I certainly would contact the Park Board in your area and inform them of your concerns.

https://www.gardeningknowhow.com/ornamental/trees/pine/pine-tree-browning.htm
https://www.gardeningknowhow.com/ornamental/trees/pine/diplodia-pine-tip-blight.htm
https://www.gardeningknowhow.com/ornamental/trees/oak/oak-wilt-disease.htm