Question

is this a sentence fragment? the agency monitoring air quality at various locations across the country. yes no

Explanation:

A sentence fragment lacks a complete subject - predicate structure. The given group of words “The agency monitoring air quality at various locations across the country” has a subject (“the agency”) but the part “monitoring air quality...” is a participial phrase, not a proper verb to form a complete predicate. So it is a sentence fragment.

Answer:

yes