If the work site fails the final air clearance tests, which action is required?

• A. Another visual inspection must be conducted
• B. Final clearance air sample must be repeated
• C. The entire cleaning process must be repeated
• D. Project must be halted for review

Answer: (B)

Final clearance testing is the check that confirms the air quality after cleanup meets the required asbestos limits before the space can be released to occupants. If the final air clearance test comes back failing, it means residual asbestos fibers may still be present and you cannot declare the area safe. The necessary step is to repeat the final clearance air sampling after additional cleaning or remediation has been done, to verify that the area now meets the standards. This repetition accounts for the fact that a single test may not reflect all conditions and ensures accuracy, not relying on a single measurement. Visual inspection alone cannot substitute for air sampling, and while more cleaning may be required, the decisive action to demonstrate compliance is a new final clearance sample. The site should not be released until the repeat test passes.