The Tree of Heaven (Ailanthus) is all over Maryland and has been for a long time. (The classic A Tree Grows in Brooklyn referred to Ailanthus. It is invasive, but it is not going to be controlled now.) People are just more aware of it now that the invasive Spotted Lanternfly has arrived and recognizes it as a preferred host plant. 
Here is our page on Tree of Heaven: 
https://extension.umd.edu/resource/tree-heaven/

It's important that you correctly identify the plants you are seeing as high-value native trees such as Sumac, Black Walnut, and Hickory trees look similar. If you pick a leaf, crush it and smell it and it smells like peanut butter, that is Tree of Heaven.
Tree of Heaven also responds differently than most other trees to removal. Simply cutting or even cutting and applying an herbicide is not recommended as they tend to respond by sending out roots and new seedlings in all directions. The link above contains info from Penn State for how to best proceed.

Here is our page on Spotted Lanternfly, which we are finding is not a serious pest of forests or agriculture (other than grapes but farmers are managing fine):
https://extension.umd.edu/resource/spotted-lanternfly-home-gardens/
Please share with your neighbors that NO pesticides are warranted or recommended for Spotted Lanternfly in home gardens, which would threaten non-target beneficial organisms.
SLF are expected to be a nuisance pest for a while, but the areas where they first arrived in large numbers are seeing few now.


Christine

Thank you for your response.   It does have a very offensive odor , I have checked and it is a tree of heaven.  I have researched how to get rid of them and it is very time consuming and costly.   I’m hoping the neighbors will see how important it is to take care of them now.    

You're welcome.