There is no description about this being born from impurity, but oaya has the same meaning as a major disaster (omaga), and is considered to be of similar divinity as Omagatsuhi no kami.
これが穢れから生まれたとの記述はないが、大綾は大禍と同じ意味であり、大禍津日神と同一神格と考えられる。