Health & Safety Regulations in Radon Mitigation Flashcards

According to ANSI/AARST MAH-2017, what is the minimum horizontal distance a radon fan exhaust must be from an operable window or door on the same or adjacent building?

Answer: 10 feet

ANSI/AARST MAH-2017 requires radon exhaust discharge points to be at least 10 feet horizontally from any operable window, door, or gravity air intake to prevent re-entry.

Which lung cancer risk classification has the International Agency for Research on Cancer (IARC) assigned to radon?

Answer: Group 1 – known human carcinogen

IARC classifies radon as a Group 1 known human carcinogen based on sufficient epidemiological evidence linking indoor radon exposure to lung cancer.

When working in a confined space during radon mitigation, what OSHA standard primarily governs entry procedures?

Answer: 29 CFR 1910.146 (Permit-Required Confined Spaces)

OSHA 29 CFR 1910.146 governs permit-required confined space entry, which applies when radon contractors must enter crawl spaces or other spaces meeting the confined space definition.

Under the Clean Air Act, radon is regulated as an indoor air pollutant primarily through which mechanism?

Answer: Voluntary guidance programs and state-level regulations rather than federal NAAQS

Unlike outdoor pollutants, indoor radon is addressed through EPA voluntary guidance, public education, and state regulatory programs rather than binding federal NAAQS under the Clean Air Act.

What is the purpose of the diagnostic System Performance Check (SPC) that ANSI/AARST standards require after radon system installation?

Answer: To verify that the system is operating as designed by measuring pressure differentials and airflow

The SPC verifies system performance by measuring sub-slab pressure differentials and fan operation, confirming the system is functioning as designed before post-mitigation testing.

A radon mitigation contractor working in a state with no radon-specific licensing law is best governed by which set of standards?

Answer: ANSI/AARST national consensus standards and voluntary NRPP or NRSB certification

In states without specific radon licensure laws, ANSI/AARST consensus standards and voluntary national certification programs (NRPP/NRSB) define the professional standard of care.

A real estate transaction requires disclosure of a previous radon test. The test result was 3.8 pCi/L. Which statement best describes the seller's disclosure obligation?

Answer: Disclosure requirements depend on state law; many states require disclosing all known test results regardless of level

Real estate radon disclosure laws vary by state; many require sellers to disclose all known radon test results to buyers, regardless of whether the level exceeds the EPA action guideline.