Using None - Elements of Styles

With none, use the singular verb when the word means "no one" or "not one."

None of us are perfect.

None of us is perfect.

A plural verb is commonly used when none suggests more than one thing or person.

None are so fallible as those who are sure they're right.

Some nouns that appear to be plural are usually construed as singular and given a singular verb.

Politics is an art, not a science.

The Republican Headquarters is on this side of the tracks.