Keep an eye out for the Emerald Ash Borer, Agrilus planipennis. It has been detected in 24 states, including our state of Washington, and parts of Eastern Canada. Civic involvement in pest ID and entomology is a powerful thing. Please inspect your local trees.
In Washington, our native "Oregon Ash" Fraxinus latifolia is of particular concern. Additionally white ash (F. americana) and green ash (F. pennsylvanica) are common targets as they are often planted as ornamental shade trees. If you suspect EAB, please call 1-800-443-6684.
See this link for more information regarding ID, and what you can do.