It was technically Christian CHR or Hot AC, which was heavy on the Rock at the time. The labels slowly stopped releasing that kind of music, so they evolved to "Positive Hits" in 2014 or so. It was basically an edgier K-LOVE. The Contemporary Worship came in 2019 (It's the most popular genre of Christian music at the moment) but they still mixed in other genres until last year.They used to be Christian Rock, thus the presence in college towns. EMF changed that in the early '10s and went to a CCM-type format, and is now worship music 24/7. Now, as a Worship station, EMF wants to expand it to every market in the U.S. to complement the K-LOVE mothership.
Side note, K-LOVE 2000s has been playing a lot of the music Air1 played back then lately. Thousand Foot Krutch, Flyleaf, P.O.D., Skillet, etc.