ACAC Council-certified Residential Indoor Environmentalist (CRIE)

Which industry standard is the primary U.S. consensus reference for professional mold remediation that a residential indoor environmentalist would cite in scope development?

• AANSI/IICRC S520
• BOSHA HazCom (29 CFR 1910.1200)
• CEPA AP-42
• DASHRAE 90.1

ANSI/IICRC S500 is the primary consensus standard for which subject?

• AMold remediation
• BProfessional water damage restoration
• CFire damage cleaning
• DAir duct cleaning

Which ASTM standard guide addresses the assessment of fungal growth in buildings?

• AASTM E1527
• BASTM D7338
• CASTM E84
• DASTM E2418

Per ANSI/IICRC S520, an indoor environment with normal fungal ecology relative to outdoor reference is classified as which condition?

• ACondition 1
• BCondition 2
• CCondition 3
• DCondition 4

Which is the primary water sample category requiring the most aggressive restoration response per ANSI/IICRC S500?

• ACategory 1 (clean water)
• BCategory 2 (grey water)
• CCategory 3 (black water)
• DCategory 4 (steam)

Which Class of water intrusion per ANSI/IICRC S500 generally has the highest evaporation load?

• AClass 1
• BClass 2
• CClass 3
• DClass 4

Which mold species is the textbook indicator of prolonged saturation of cellulose materials such as drywall paper?

• ACladosporium herbarum
• BStachybotrys chartarum
• CAlternaria alternata
• DAspergillus niger

What is the standard sampling flow rate for an Air-O-Cell spore trap cassette?

• A5 L/min
• B10 L/min
• C15 L/min
• D25 L/min

Which type of sampling is most appropriate for documenting visible mold growth on a wall surface for laboratory identification?

• ATape lift (clear cellophane tape impression)
• BAir-O-Cell spore trap
• CERMI dust sample
• DBulk demolition

Which is the primary IICRC S520 PPE recommendation for a worker remediating a Condition 3 mold contamination of approximately 30 sq ft on drywall?

• AN95 respirator only
• BHalf-face APR with P100 filters, gloves, and goggles
• CNo PPE required for small areas
• DSurgical mask

Which is true about EPA's 10 sq ft mold area threshold from 'A Brief Guide to Mold' (EPA 402-K-02-003)?

• AAbove 10 sq ft, EPA recommends professional remediation
• BAbove 10 sq ft, mold is officially classified as 'toxic'
• CAbove 10 sq ft, remediation is prohibited
• DAbove 10 sq ft is the OSHA exposure limit

Which is the appropriate use of a pin-type moisture meter in residential indoor environmental assessment?

• ANon-destructive estimate only
• BDestructive measurement of moisture content (or wood moisture equivalent) at specific dep…
• CAir sampling
• DSurface temperature

Which is the primary IAQ-relevant function of an infrared camera during a residential indoor environmental assessment?

• ADetect mold directly
• BIdentify surface temperature anomalies that may indicate moisture intrusion, missing insu…
• CMeasure airborne mold concentration
• DIdentify mold species

Which is the recommended timeframe for drying water-damaged materials to minimize mold amplification per ANSI/IICRC S500 / S520?

• A1-2 weeks
• B24-48 hours
• C30 days
• D6 months

Which is the appropriate residential indoor environmental investigator response to a homeowner report of musty odor with visible water staining on a basement wall?

• ADismiss the complaint
• BConduct a walkthrough including visual inspection, moisture mapping (pin/pinless meter, I…
• CApply biocide and leave the wall
• DPaint over the staining

Which is true about the relationship between assessment (IEP) and remediation (mold remediation contractor) per ANSI/IICRC S520?

• AThe same firm should perform both
• BAssessment and remediation should be conducted by separate parties to avoid conflict of i…
• CRemediation contractors design their own clearance
• DIEPs perform the demolition

Which is the primary purpose of indoor-to-outdoor spore count comparison during a mold investigation?

• AConfirm spore count is exactly equal
• BIdentify whether indoor spore counts are elevated above outdoor baseline and whether unus…
• CEliminate outdoor sampling
• DPredict weather

Which is the recommended range for indoor relative humidity to discourage mold growth and dust mite proliferation?

• A10-20%
• B30-60%
• C65-80%
• D80-95%

Which standard is the primary U.S. consensus reference for Phase I Environmental Site Assessment that a CRIE may encounter in residential investigations involving contamination concerns?

• AASTM E1527
• BANSI/IICRC S520
• CASTM D7338
• DASHRAE 90.1

Which ASTM standard addresses chain-of-custody documentation for environmental samples?

• AASTM E1527
• BASTM E2418
• CASTM D7338
• DASTM E84

Which is the recommended approach to sample collection for an air sampling investigation in a residence with suspected mold?

• ASingle sample from one room only
• BStrategically located samples (suspect area, adjacent unaffected areas, outdoor reference…
• CRandom sampling without documentation
• DSample only when wind is high

Which is the appropriate documentation expected of a CRIE in a defensible mold investigation report?

• AVerbal summary only
• BWritten report with methodology, observations, instrument calibration notes, photographs…
• COne-page summary
• DPhotos only

Which is the typical sampling approach for residential allergen assessment (dust mite, cockroach, cat, mouse)?

• AAir sampling only
• BDust sampling (vacuumed from specific areas) analyzed for allergen content (e.g., Der p 1…
• CSurface ATP
• DOutdoor pollen sampling

Which is the appropriate sample for residential radon assessment per EPA guidance?

• AShort-term test (2-90 days) followed by long-term test (>90 days) when above action level…
• BSurface tape lift
• CIndoor air sample by Air-O-Cell cassette
• DOutdoor air sample only

Which is the EPA action level for radon in residential indoor air?

• A1 pCi/L
• B2 pCi/L
• C4 pCi/L
• D10 pCi/L

Which is the appropriate residential indoor environmental assessment response to a homeowner with a child who has unexplained respiratory symptoms in the home?

• ADismiss as outdoor allergies
• BConduct comprehensive walkthrough (moisture, allergens, combustion safety, VOCs, radon),…
• CSample only the bedroom
• DRecommend home demolition

Which is the OSHA Permissible Exposure Limit (PEL) for carbon monoxide as 8-hour TWA?

• A9 ppm
• B25 ppm
• C50 ppm
• D200 ppm

Which is the most common source of indoor formaldehyde in residential environments?

• AOutdoor air infiltration only
• BComposite wood products (UF resins), some insulation, smoking, and certain consumer produ…
• CCooking oils
• DDrinking water

Which sampling method is appropriate for residential VOC characterization?

• ATVOC meter only
• BSorbent tubes (EPA TO-17) or canister (EPA TO-15) with GC/MS analysis for specific VOCs o…
• CSurface ATP
• DOutdoor pollen samples

Which is the most appropriate IICRC standard to reference for assessing a residence with significant smoke damage from a wildfire?

• AANSI/IICRC S520
• BANSI/IICRC S500
• CANSI/IICRC S700 (fire and smoke damage restoration)
• DANSI/IICRC S100

Which is the appropriate response when a CRIE finds visible mold growth on a wall and the homeowner asks whether to test before remediation?

• AAlways test extensively before remediation
• BPer EPA and S520 guidance, when mold is visible the priority is identifying and stopping…
• CNever test under any circumstance
• DSend a single tape lift sample for genus identification before any cleanup

Which is a common state-level regulatory consideration for mold inspectors in some U.S. states (e.g., NY, FL, TX)?

• AFederal license required nationwide
• BState-specific licensing or registration (e.g., NY Mold Law Article 32, Florida Chapter 4…
• COSHA inspector license
• DFDA registration

Which is the appropriate use of an ERMI (Environmental Relative Moldiness Index) sample?

• AReplace visual inspection
• BProvide a DNA-based dust mold profile that supplements (not replaces) visual inspection a…
• CDetermine OSHA compliance
• DDiagnose human disease directly

Which is the appropriate residential indoor environmental assessment consideration during a flooding event with Category 3 water (sewage)?

• ATreat as Category 1
• BApply ANSI/IICRC S500 Category 3 protocols: PPE (Tyvek, half-face P100 minimum, gloves, e…
• CUse only paper masks
• DDry passively

Which is the typical respirator recommendation for a CRIE conducting an inspection of a Condition 3 mold area without performing remediation?

• ANo respirator
• BN95 minimum, or higher (half-face APR with P100) depending on scope and duration
• CFull self-contained breathing apparatus (SCBA)
• DSurgical mask

Which is the appropriate residential indoor environmental assessment of a crawl space with persistent moisture and visible mold?

• ARecommend painting only
• BIdentify and stop moisture source (drainage, vapor barrier, ventilation), assess for visi…
• CApply biocide and seal
• DIgnore the crawl space

Which is the appropriate consulting approach when a homeowner asks about 'mold toxins' (mycotoxins) in their home?

• AConfirm mycotoxin diagnosis
• BExplain that environmental mycotoxin testing has interpretation challenges and is not par…
• CRecommend immediate evacuation
• DSell a mycotoxin removal product

Which is the appropriate residential indoor environmental assessment of a basement with persistent water seepage and a sump pump?

• AIgnore basement water
• BAddress water management (perimeter drainage, sump pump capacity, foundation integrity),…
• CApply bleach to floor
• DAdd a humidifier

Which is the appropriate residential indoor environmental assessment response to a homeowner with a new addition that emits formaldehyde-like odors causing irritation?

• ARecommend tolerance
• BInvestigate composite wood and other emitting materials, recommend ventilation/flush-out,…
• CApply paint
• DIgnore the issue

Which is the appropriate residential indoor environmental approach to a home with reported asbestos-containing materials (ACM) in popcorn ceilings or floor tiles?

• ASand the ceiling to remove ACM
• BPer EPA and OSHA, do not disturb suspect ACM; if testing is needed, use a state-certified…
• CApply bleach
• DPaint over

Which is the appropriate residential indoor environmental approach when investigating a pre-1978 residence for lead hazards per EPA RRP rule (40 CFR 745)?

• ASand and repaint without precaution
• BUse EPA Lead-Safe Certified Renovator and follow lead-safe work practices (containment, d…
• CSpray with bleach
• DIgnore lead hazards

Which is the typical IAQ-related role of an indoor environmental investigator regarding combustion safety testing in a tightly sealed home?

• ATest CO, CO2, draft, and spillage at gas appliances per BPI / RESNET protocols
• BReplace the appliances directly
• CDiscontinue gas appliances
• DNo combustion safety testing needed

Which is the appropriate residential indoor environmental assessment of a home with persistent musty odor but no visible mold?

• AConclude there is no mold problem
• BConduct moisture mapping (pin/pinless meter, IR camera), check hidden areas (behind walls…
• CApply air freshener
• DRecommend home demolition

Which is the appropriate sampling approach to confirm post-remediation conditions in a previously Condition 3 area?

• ANo sampling needed
• BVisual inspection plus post-remediation verification (PRV) sampling — air sample(s) compa…
• CRandom surface sample only
• DOutdoor sample only

Which is the appropriate documentation of sample chain-of-custody for litigation-quality residential indoor environmental sampling?

• ANo documentation needed
• BSample ID, collector signature, date/time, sample type, location, transfer signatures at…
• CVerbal hand-off only
• DPhotograph only

Which is the role of a CRIE during litigation involving residential mold/water damage?

• ARefuse to participate
• BServe as an independent expert based on documentation, sampling, and standards — providin…
• CAdvocate for one party against evidence
• DProvide undocumented opinions

Which is the appropriate residential indoor environmental approach to investigate a home with a finished basement that has experienced repeated water intrusion?

• AApply more paint
• BInvestigate moisture source (drainage, foundation, plumbing, vapor barrier), assess hidde…
• CAdd a humidifier
• DIgnore