Companies that store hazardous waste liquids with organics or other volatile and light vapors should ensure that the tanks, containers, and equipment used at those facilities satisfy the RCRA Organic Air Emission Standards in Subparts AA, BB, and CC under 40 CFR Parts 264 and 265.  Over the past month, EPA has announced at least five separate penalty enforcement actions for air emission violations under the Subpart BB and Subpart CC standards.  EPA promulgated the RCRA hazardous waste air emission standards to reduce the release of air emissions and organic vapors into the atmosphere from hazardous waste tanks, containers, equipment, and process vents, to prevent ozone precursors and other air toxics.