Q.What Are The Little Yellow Leaves Falling From Our Linden?
,they are long narrow yellow leaves falling like snow flakes. This summer is the worst they have ever been.

Certified GKH Gardening Expert
It could be too little or too much water, a fungal disease, or an insect problem such as aphids. These articles should help:
https://www.gardeningknowhow.com/ornamental/trees/linden/diseases-of-linden-trees.htm
https://web.extension.illinois.edu/askextension/thisquestion.cfm?threadid=15108&catid=34&asksiteid=34
https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/linden/branchesdead.html
https://hort.extension.wisc.edu/articles/verticillium-wilt-of-trees-and-shrubs/
https://www.gardeningknowhow.com/ornamental/trees/linden/linden-tree-information.htm