100+ Free Applied Microbial Remediation Technician Practice Questions

The IICRC Applied Microbial Remediation Technician (AMRT) is the foundational technician credential for professional mold and microbial remediation. It is governed by ANSI/IICRC S520 and covers mold biology, condition classification, PPE, containment, HEPA filtration, remediation procedures, sampling, and documentation. Candidates earn the credential by completing an IICRC-approved 3-4 day training course and passing the end-of-class proctored exam with a score of 75% or higher.

The AMRT credential is maintained through annual IICRC renewal, which requires payment of the renewal fee and completion of continuing education credits as required by IICRC. Lapsed credentials may be reinstated under IICRC policy, but ongoing compliance is the technician's responsibility.

ANSI/IICRC S520 defines three contamination conditions for indoor environments. Condition 1 is normal fungal ecology — no abnormal or elevated mold growth and the goal state for any remediation project. Condition 2 is an environment that has been contaminated by settled or airborne mold spores originating from an adjacent Condition 3 source, without visible growth in the Condition 2 area itself. Condition 3 is an environment with active visible mold growth on building materials, requiring physical source removal. AMRT technicians must be able to identify and document each condition before scoping remediation.

Respirator selection depends on the contamination level and the project scope. For limited Condition 2 work and short tasks, a half-mask APR with P100 filters and a disposable Tyvek suit is typical. For larger projects, Condition 3 active growth, or irritant exposure, a full-face APR provides eye protection plus higher assigned protection. A PAPR provides the highest comfort and protection for extended or heavy-load tasks. N95 filtering facepiece respirators are only appropriate for very limited exposures. All respirator use must comply with OSHA 1910.134 — including a written program, medical evaluation, training, and annual fit testing.

Cleaners physically remove soils, including mold spores and fragments, without making pesticidal claims. Antimicrobials and biocides are EPA-registered pesticides under FIFRA (40 CFR Part 152) that are intended to kill or inhibit microbial growth — they must have a current EPA registration number and be used strictly per their label, including the specific sites and surface types listed. AMRT principles teach that biocides and antimicrobials are supplemental — they do not substitute for physical source removal. Spraying a biocide onto active visible mold growth without removal is a violation of S520 principles.

Best practice under ANSI/IICRC S520 is that an independent Indoor Environmental Professional (IEP) performs post-remediation verification (PRV), not the remediation contractor — this avoids a conflict of interest in approving the contractor's own work. PRV typically requires (1) a visual inspection confirming no visible mold growth in the remediated area, and (2) air or surface sampling consistent with Condition 1 (normal fungal ecology), often demonstrated by indoor sample results similar in count and species distribution to simultaneously collected outdoor reference samples.