You will be given a definition of a task first, then some input of the task.
In this task, you're given a pair of sentences, sentence 1 and sentence 2. Your job is to determine if the two sentences clearly agree/disagree with each other, or if this can't be determined. Indicate your answer as yes or no respectively.

Sentence 1: The revisions of the National Ambient Air Quality Standards (NAAQS) aimed at reducing haze may require electric utility sources to adopt additional control measures. Sentence 2: At the moment, no air quality standards exist.
Output:
yes