Which agency defines Class 1 through Class 4 asbestos work for construction?

• A. Cal OSHA
• B. EPA
• C. OSHA
• D. NIOSH

Answer: (A)

The main idea is that California regulates asbestos work in construction using a defined four-class system, and the authority that sets these definitions and the associated requirements is Cal/OSHA. In California, Cal/OSHA’s asbestos standards establish Class I through Class IV tasks to determine what materials and activities fall under each class and what protections, training, and controls are required. For example, Class I covers removal of friable asbestos-containing materials, Class II covers removal of other ACM materials, Class III involves repair and maintenance where ACM may be disturbed, and Class IV applies to custodial work where ACM-containing products are present but not disturbed. This framework directly shapes the level of protection and compliance on California job sites. While federal OSHA also uses similar classifications in its standards, the CA-specific definitions and enforcement come from Cal/OSHA, making it the authoritative source in California.