Premise: This rule implements section 112(r) of the Clean Air Act Amendments of 1990, which mandates that EPA promulgate regulations and develop guidance to prevent accidental releases to the air from stationary sources and mitigate the consequences of such releases by focusing prevention measures on chemicals that pose the greatest risk to the public and the environment.

Hypothesis: They wanted to make sure they were keeping the air as clean as they could.
Relation: neutral