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ENVIRONMENTAL HAZARDS - INSPECT, TEST, REMEDY
ACCEPTABLE MOLD LEVEL
ACCURACY vs PRECISION of MEASUREMENTS
ACTION GUIDE - WHAT TO DO ABOUT INDOOR MOLD
ACTIVITY of MOLD in BUILDINGS
AIR TEST FOR MOLD: ACCURACY
AIR TEST SAMPLING CASSETTE STUDY
AIRBORNE MOLD COUNT NUMBER GUIDE
AIRBORNE PARTICLE ANALYSIS METHODS
Particles per Cubic Meter
Quantitative Particle Counts
Lab Chemicals for Particle Samples
Qualitative Vacuum Sample Analysis
Qualitative Surface Analysis
Sample Microscope Calculations
Example Count w/ Allergenco Sampler
Alternative count procedure
Counting Airborne Mold Concentrations
Airborne Mold or Level Reporting
Equipment Trace Dimensions
ALLERGEN TESTS for buildings
ALLERGENS in BUILDINGS, RECOGNIZING
ALLERGY & MOLD IAQ PRODUCTS
ALLERGY TESTS for PEOPLE
ALLERGY TEST ACCURACY
ANIMAL ALLERGENS / PET DANDER
ANIMAL ENTRY POINTS in buildings
ASBESTOS CLEANUP COMPANIES
ASBESTOS ROOFING / SIDING DUST
ASBESTOS IDENTIFICATION IN buildings
BASEMENT MOLD WATER IMPACT
BROWN HAIRY BATHROOM MOLD
BIBLIOGAPHY for ENVIRONMENTAL HEALTH, MOLD, IAQ
BOD WASTEWATER TEST
BLACK MOLD, HARMLESS COSMETIC
BLACK MOLD, TOXIC & ALLERGENIC
BLEACHING MOLD, Advice about
BLUE vs YELLOW COMBUSTION FLAMES
BOOK MOLD, Moldy Book Cleaning
BOOKSTORE - ENVIRONMENTAL
CACTUS FUNGI / MOLD
CAR MOLD CONTAMINATION
CARPET DUST IDENTIFICATION
CARPET MOLD CONTAMINATION
CARPET PADDING ASBESTOS, MOLD, ODORS
CARPET FUNGICIDAL SPRAY
CARPET STAIN DIAGNOSIS
CARPET & other STAIN TESTS
CARPET TEST PROCEDURE
CARPETING & INDOOR AIR QUALITY
CHAIN OF CUSTODY - TEST SAMPLE
CLEARANCE INSPECTIONS - MOLD CLEANUP
DIRECTORY of MOLD / ENVIRONMENTAL EXPERTS
DIRT FLOOR MOLD CONTAMINATION
DISINFECTANTS & SANITIZERS, SOURCES
DISINFECTING BUILDINGS with BLEACH
DO-IT-YOURSELF MOLD CLEANUP WARNINGS
DRYWALL MOLD TESTING
DUCT SYSTEM & DUCT DEFECTS
DUST ANALYSIS for FIBERGLASS
DUST, HVAC CONTAMINATION STUDY
DUST SAMPLING PROCEDURE
EFFLORESCENCE SALTS & WHITE DEPOSITS
EMERGENCY RESPONSE, IAQ, GAS, MOLD
FEAR of MOLD - MYCOPHOBIA
Fiberboard Insulation Sheathing Mold
FIBERGLASS INSULATION MOLD
FIBERGLASS PARTICLE CONTAMINATION TEST
FIELD INVESTIGATION SERVICE
FIND MOLD, ESSENTIAL STEPS
MOLD in BUILDINGS
FIRE DAMAGE vs MOLD DAMAGE
FLOOD DAMAGE ASSESSMENT, SAFETY & CLEANUP
FLOODS IN BUILDINGS-mold
FOXING STAINS on books & papers
FUNGICIDAL SPRAY & SEALANT USE GUIDE
GAS DETECTION INSTRUMENTS
GAS EXPOSURE EFFECTS, TOXIC
GAS EXPOSURE LIMITS & STANDARDS
GAS TEST PROCEDURES
HOUSE DUST ANALYSIS
HOUSE DUST COMPONENTS
HOUSEWRAP AIR & VAPOR BARRIERS
HIDDEN MOLD, HOW TO FIND
HUMIDITY CONTROL & TARGETS INDOORS
INDOOR AIR QUALITY & HOUSE TIGHTNESS
INDOOR AIR QUALITY IMPROVEMENT GUIDE
VENTILATION, WHOLE HOUSE STRATEGIES
Air Filtering Strategies
PARTICLES in INDOOR AIR, CHART
AIR CLEANER PURIFIER TYPES
Air Filter Effectiveness
Air Pollutants, Finding & Reducing
RADON HAZARD TESTS & MITIGATION
INDOOR AIR QUALITY METHODS COMPARED
Air Sampling Equipment
Bulk & Surface Tape Sampling
Cultures, Swabs, Home Test Kits for Mold
Sampling for gases
Mold Test Laboratory Procedures
Indoor Air Investigation Reports
What to do about mold-Key References
LAB PROCEDURES MICROSCOPE TECHNIQUES
LEAD POISONING HAZARDS GUIDE
LEGIONELLA LEGIONNAIRES' DISEASE
Legionella BACTERIA & HVAC Equipment
LIGHT, GUIDE to FORENSIC USE
GAS LP & NATURAL GAS SAFETY HAZARDS
MEDIA BLASTING for MOLD REMOVAL
METHANE GAS SOURCES
MICROSCOPE DIGITAL PHOTOGRAPHY
MILDEW in BUILDINGS ?
MILDEW ERRORS, IT's MOLD
MILDEW REMOVAL & PREVENTION
MOISTURE CONTROL in BUILDINGS
MOLD: A COMPLETE GUIDE TO MOLD
MOLD ACTION GUIDE - WHAT TO DO ABOUT MOLD
MOLD APPEARANCE - WHAT MOLD LOOKS LIKE
MOLD CLEANERS - WHAT TO USE
MOLD CLEANUP GUIDE- HOW TO GET RID OF MOLD
MOLD CLEARANCE INSPECTIONS
MOLD COUNT NUMBER GUIDE
MOLD CONSULTANTS / INSPECTORS
MOLD CULTURE TEST KIT VALIDITY
MOLD DETECTION & INSPECTION GUIDE
MOLD or INDOOR AIR EMERGENCY RESPONSE
MOLD EXPERT, WHEN TO HIRE
MOLD LEVEL IN AIR, VALIDITY
MOLD ODORS, MUSTY SMELLS
MOLD PREVENTION GUIDE
MOLD RELATED ILLNESS GUIDE
MOLD SAFETY WARNINGS
MOLD SPRAYS, SEALANTS, PAINTS
MOLD TEST KITS
MOLD TESTING METHOD VALIDITY
MSDS Material Safety Data Sheets
MVOCs & MOLDY MUSTY ODORS
MYCOPHOBIA, STAINS MISTAKEN for MOLD
MYCOTOXIN EFFECTS of MOLD EXPOSURE
NOISE / SOUND DIAGNOSIS & CURE
ODORS GASES SMELLS, DIAGNOSIS & CURE
PAINTS & COATINGS ODORS IN BUILDINGS
PARTICLE SIZES & IAQ
Particulates & Allergens Indoors
PESTICIDE EXPOSURE HAZARDS
PET ALLERGEN REMEDIES
PLASTIC CONTAINERS, TANKS, TYPES
PLASTIC Plexvent / Ultravent RECALL
PLASTIC ODORS-SCREENS, SIDING
PLUMBING SYSTEM ODORS
RENTERS GUIDE TO MOLD & IAQ
ROBIGUS & Wheat Rust Fungus
ROT RESISTANT LUMBER
ROT, TIMBER FRAME
ROT, TIMBER ASSESSMENT
SLIDE PREPARATION, MICROSCOPE
SMELL PATCH TEST to Track Down Odors
SOUND CONTROL in BUILDINGS
STAIN & BIODETERIORATION AGENT CATALOG
STAINS on & in BUILDINGS, CAUSES & CURES
STAINS on CONCRETE
STAIN DIAGNOSIS on BUILDING EXTERIORS
STAIN DIAGNOSIS on BUILDING INTERIORS
STAINS on INDOOR SURFACES: PHOTO GUIDE
STAINS & Thermal Tracking
TECHNICAL & LAB PROCEDURES
TEST KITS for DUST, MOLD, PARTICLE TESTS
Thermal Expansion Cracking of Brick
THERMAL EXPANSION of HOT WATER
THERMAL EXPANSION of MATERIALS
THERMAL IMAGING, THERMOGRAPHY
THERMAL IMAGING MOLD SCANS
THERMAL MASS in BUILDINGS
THERMAL TRACKING & THERMAL BRIDGING
TRAPPED MOLD BETWEEN WOOD SURFACES
TRIM, INTERIOR INSTALLATION
TRUSS UPLIFT, ROOF
TRUSSES, Floor & Roof
UREA FORMALDEHYDE FOAM INSULATION, UFFI
URETHANE FOAM Deterioration, Outgassing
UV LIGHT BLACK LIGHT USES
VAPOR BARRIERS & CONDENSATION in BUILDINGS
VENTILATION in BUILDINGS
VINYL CHLORIDE HEALTH INFO
VINYL SIDING or WINDOW PLASTIC ODORS
VOCs VOLATILE ORGANIC COMPOUNDS
WALL SIDING TRIM & FINISHES
WALL FINISHES INTERIOR
WALL CONSTRUCTION BARRIER vs CAVITY
WATER BARRIERS, EXTERIOR BUILDING
WATER ENTRY in BUILDINGS
WATER ODORS, CAUSE CURE
WORLD TRADE CENTER 9-11 DUST PHOTOS
Indoor air quality methods and methodology: this article lists and compares classes of mold, air, gas, test methods used in indoor air quality investigation methodology in searching for possible causes of respiratory illness, asthma, immune system disorders, rashes, skin disease, psychological and neurological disorders, eye infections, or other symptoms which may have a physiological and environmental component.
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Methods of inspection and testing building air quality for toxic mold, allergen or other sick house investigations, mold lab testing services, information on mold, mildew, moisture, pollen, dust mite, & environmental testing for home buyers, home owners, consultants, as well as a service to provide on-site field investigations and expert mold laboratory testing, and mold identification services are offered.
Links here organize the indoor air quality methods portion of our environmental website and take the reader either directly to an in-depth article or to the collection of such articles addressing a particular environmental or IAQ topic.
Air sampling equipment used for particle or mold sampling in buildings includes some useful, expensive tools, but if used alone, air sampling is not reliable for characterization of building conditions. In short, a "negative" (no mold problem detected) result is not reliable because the level of airborne particles in indoor air varies by several orders of magnitude from minute to minute in a building. Waving a notebook, turning on or off a fan, opening a door, even walking across carpeting can completely change the level of airborne particles.
A mold inspector who relies only on tests and who omits thorough visual inspection, history taking, occupant interviews,etc. is not making a reliable mold-assessment of a building.
We collected comparison samples using different collecting devices as well as by using adhesive tape, for laboratory analysis.
Vacuuming furniture to test for mold contamination may be useful for general qualitative assessment when an expert has examined the building and its content.
Vacuuming building insulation may be the most reliable non-quantitative approach to detecting mold-contaminated fiberglass insulation.
Quantitative analysis of such samples is questionable.
Tape to collect mold or other surface sampling methods provide useful, inexpensive tools which, combined with careful visual inspection, are reliable and inexpensive for characterization of building conditions. Particles collected are very useful for genera and often mold species identification.
MOLD CULTURE TEST KIT VALIDITY describes the testing limitations or INVALIDITY of these methods for determining what contaminants are in a building - see Validity of Cultures (settlement plates or swabs) to find toxic mold in buildings .
Only about 10% of all molds will grow on any culture medium whatsoever, and there are literally hundreds of culture media mycologists have developed to try to coax mold to grow in the laboratory.
90% wrong to start: So the moment you open your "mold culture test kit" you're roughly 90% wrong in whatever conclusion you and your kit are going to reach. (We're exaggerating slightly because not all of the 1.5 million mold species will grow indoors in buildings anyway).
The mold that likes the culture media and grows on it may not be the mold that is a problem in the building anyway - it may just be a nice marriage between what fell onto the plate and the chemistry of the mold growth media.
The rate that particles fall out of the air has no reliable correlation to how many of them are in a building or where they're coming from.
So where's the mold? The most troubling thing about this and some other mold test kits, when used by someone who's not an expert, is that even if the mold test kit indicates the presence of a problem mold, and even if the kit "got it right" in a particular case (that is, the mold it detected is actually the main problem in the building), we don't know where the problem is nor how big it is nor what to do about it.
Mold Sniffing Dogs as a Building Screen for Mold
Mold sniffing dogs are unreliable, though fun. For details, see INEFFECTIVE MOLD PRODUCTS for an explanation of why mold sniffing dogs make poor mold detectives and why it's not good for them anyway.
There's no doubt that a dog can be trained to smell mold. What is the dog smelling? MVOCs.
Not all molds generate MVOCs, and even molds that do generate MVOC's don't do so all the time. If the humidity, temperature, light, and other factors don't cause a particular MVOC-generating mold to release this gas, you're not going to detect it on the day of the inspection and test. Just later. Even if we detect MVOCs, is that the problem mold in the building?
Beagles are short as dogs go - and are not good at sniffing out MVOC's that telltale a mold problem high in a building wall or in a ceiling.
Beagles are cute, though.
Infrared, Thermography, & MVOC Testing as a Building Screen for Mold
These good tools form a part of the arsenal of building investigation tools for many uses and problems, but they are unreliable as a building screen for mold.
IR and Thermography detect temperature differences, not mold. In short, IR, or thermography, which are wonderful and fun tools to use, only detect temperature differences. If your building has a mold problem in a wall or ceiling due to a leak that occurred a long time ago, the cavity may now be quite dry. The mold is happily growing along on ambient moisture, but the IR won't detect a thing.
IR and thermography are good at seeing leaky windows and doors, though. At one of our investigations a "mold killing" company had charged our client a few thousand dollars to "spray biocide into the moldy walls". Our acquaintance who owns the company was excited with his new IR camera and used it as a "mold detector" - now this is a smart thing to do if you're looking for what building cavities have just gotten wet due to a leak.
But in this case what he detected was cool spaces around windows and doors - which is where he sprayed his biocide and "mold killer". When we cut open those walls we found absolutely no indication that there had ever been mold present, nor leaks, nor anything but lower temperatures. The mold problem (there was one) was in a completely different area of the home.
IR and thermography are great tools in the hands of an expert. They're not a mold detector.
For details see INEFFECTIVE MOLD PRODUCTS for an explanation of why this is so.
Not all molds generate MVOCs, and even molds that do generate MVOC's don't do so all the time. If the humidity, temperature, light, and other factors don't cause a particular MVOC-generating mold to release this gas, you're not going to detect it on the day of the inspection and test. Just later. Where's the mold smell or musty odor problem source? Even if we detect MVOCs, is that the problem mold in the building? If we don't detect MVOC's does that promise there is no problem mold? No.
Production of toxins and microbial volatile organic compounds (MVOCs) by fungi in an environmental sample is dependent upon many factors, such as the substrate on which mold is growing, relative humidity and temperature in the moldy environment; the relative importance of each of these factors in toxin production is poorly understood.
Our Indoor Gas Sampling Plan for Residential buildings describes gas testing procedures, instruments, detection limits, and it lists some of the toxic (or other) indoor gases for which we can test, depending on the building complaint and building conditions.
TECHNICAL PROCEDURES describes proper mold testing laboratory procedures, and sample processing not by a "supervised" technician but by a qualified expert are critical in making sense of field samples.
Competent, trained, experienced aerobiologists, mycologists, and microbiologists can identify sample contents with good accuracy.
Depending on the experience of the laboratory, it is also possible to interpret the meaning of the sample for the building and its occupants.
Laboratory professionals who have also performed the field inspection can often offer useful interpretations of even low levels of certain particles or classes of particles found in indoor air or surface dust. For example, if a field test for mold detects certain fungi not usually found on indoor surfaces, those molds may not themselves be a likely health hazard to building occupants, but they may be common water-indicators that suggest that further investigation of the building is in order to look for the presence other, more problematic molds that the initial investigation failed to detect.
MOLD INVESTIGATION REPORTS provides a document outlining what to look for in a toxic mold field investigation report or mold test laboratory report. we have been troubled that some very costly "mold investigators" simply collect a few air, culture, or swab samples, toss them over to a mold testing lab, and give their clients the lab report.
A valid and useful mold investigation needs to include a detailed visual inspection to identify problem sources, the presence and extent of a mold or other problem reservoir, and then it needs to provide the supporting lab work to justify what may be a costly cleanup (i.e. let's not spend a lot cleaning up "cosmetic" mold). The end product of the investigation needs to include the following
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Frequently Asked Questions (FAQs) about toxic or harmful mold or gas or similar indoor air quality hazards: contamination testing methods & procedures
Questions & answers or comments about IAQ, Toxic Gas, & Indoor Mold contamination testing methods & procedures.
Use the "Click to Show or Hide FAQs" link just above to see recently-posted questions, comments, replies, try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.
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Technical Reviewers & References
Allergies, Allergens, Allergy Testing in buildings - References & Products
Mold Contamination Testing, Cleanup, Prevention: references & products
OTHER IAQ ISSUES: How To Find and Address Other Indoor Air or Indoor Environment Contaminants Besides Mold
Mold or allergens may not be the only or even the main indoor environmental contaminant. Don't let media attention to mold cause so much enviro-scare fear that other, possibly more urgent hazards go un-addressed.