Should You Capitalize “Ground Zero”?
More than a decade after 9/11, style guides still disagree about whether writers should capitalize “ground zero” when it refers to the site of the 2001 New York suicide attacks.
I believe “ground zero” should be capitalized because it is a proper noun that names a specific place, not simply a descriptive common noun. Style guides for The Guardian and The Baltimore Sun concur.
On the other hand, the Associated Press and The New York Times keep “ground zero” lowercase.
When style guides disagree, if you are not bound by one style, you get to choose which style you prefer. Once you choose a style, be consistent.