Responding to Risk of Odorless Gases & Chemicals in Buildings
ODORLESS CHEMICALS / GASES: CHECK FOR? - CONTENTS: Hazards from odorless chemicals: should we worry about odorless building contamination sources: gases, chemicals, products?Examples of potentially harmful odorless chemicals or gases in buildings. Strategy for deciding how far to go in testing for invisible, odorless indoor hazards. How to identify odors or gases by type, source, and toxicity. Noxious odors or smells in buildings can be diagnosed and cured
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Odorless gas or chemical hazards in buildings: this article discusses what to do about indoor contaminants that might not smell or give any ready indication of their presence. This website series provides articles on to diagnose, test, identify, and cure or remove a wide range of obnoxious or even toxic
odors in building interiors, building mechanical systems, or in building water supply.
We discuss odors from a variety of sources including
animals including pets, dogs, cats, or unwanted animals or dead animals, formaldehyde odors in buildings from building products or furnishings, plumbing drains, plastic or vinyl odors from building products, flue gases, oil tanks or oil spills, pesticides,
septic odors, sewer gases, and even abandoned chemicals at properties.
Our page top photo shows outdoor evidence of a radon mitigation system at a building. Radon is an example of an odorless, colorless gas that at elevated levels can be a health hazard for building occupants.
How to Think About Indoor Contaminants that Avoid Detection - Gases or Chemicals that do not Produce a Smell
Question About Indoor Chemical or Gas Hazards that Don't Smell
I am writing to ask you whether it is true that some chemicals are odorless. The reason for the question is that the smell seems to be dissipating. However, since we we do not know what the source of the smell was, we cannot know for sure whether the source causing the smell can still be harmful to our unborn baby.
-- Jacqueline Saenz, CA.
OPINION: Some chemicals are odorless - for example see "Fish Tale" in the New York Times. The article discussed a type of food poisoning (not a building material or sewer gas issue) associated with unsafe seafood - ciguatera poisoning (eating fish contaminated with a toxin that grown on reef algae) stating "Unlike most other causes of food poisoning, this toxin is colorless and odorless and isn't destroyed by cooking."
RADON HAZARD TESTS & MITIGATION : if your building is over radon-bearing soils and rock, this odorless, colorless gas could be a health hazard. Testing and remediation are well understood and not technically difficult.
Similarly, carbon monoxide (CO) gas, can be found in buildings where there is a gas burning appliance or chimney defect, is odorless and colorless. See CARBON MONOXIDE - CO
But neither radon nor CO is ever smelly. So if there was an indoor odor present that later dissipated, it was not likely to be one of those particular hazards.
Because your original question (not included above) concerned sewer gas, it would be methane, not CO gas would have been more likely to be detected in your building. Sewer gas, a complex of gases, is not normally odorless. But sewer gas odors can indeed "come and go" depending on several variables, as we discuss below.
Building Indoor Odors / Smells that Eventually Diminish or Stop Completely
The types of building materials that smell for a while but then stop on their own, with no discover, repair, or removal of the offending source, include:
New building products - smells that dissipate and do not usually return, material, coatings, especially products that emit VOCs or other gases such as formaldehyde.
Examples of sources of indoor odors that typically diminish or stop entirely include some brands of carpeting, cabinets or shelving made from particle board, furniture (upholstered furniture using certain foam products and possibly even coverings such as a vinyl couch, glues used in applying tile or other ceiling or flooring products, some plywood products, rubber tub mats, sheet flooring (vinyl floors), paints, vinyl or rubber window curtains or shower curtains.
We found a horrible building chemical smell traced to new 6-mil polyethylene plastic that had just been placed on the ground over a crawl space that extended below the structure. See
Animal smells - odors from visiting animals may eventually dissipate after the pest or pet has been out of the building for weeks or months.
Heating Equipment, Age, Types, furnaces, boilers, water heaters, if there is a chimney cap or other venting defect, may make odors intermittently in buildings - for example stopping seasonally when the heater is not used.
See BACKDRAFTING HEATING EQUIPMENT.
Changes in building conditions can make even a long-lasting odor "come and go", including
Variations in building indoor temperature and humidity
Variations in weather, building leaks and moisture levels from outside conditions that affect the indoors
Changes in building air movement: fans on or off, doors open or shut, windows open or shut, elevators in use or not, stairwells open or closed, different HVAC equipment in or out of use (heating vs cooling), cars running in a garage with a garage door open or shut (watch out for fatal carbon monoxide poisoning)
So How Might we Suspect and Decide to Test for an Odorless Gas or Chemical in Our Apartment?
Luckily, in most cases in buildings and building materials, problem chemicals or gases are delivered in a soup of materials, not in a pure form, and even if the dangerous material is odorless, most often it is in a soup that has an odor. For example,
see BOILER NOISE SMOKE ODORS.
For example, carbon monoxide may be odorless, but if it's being delivered by a chimney leak or a car exhaust, other ingredients in those gases are often noticeable.
Watch out: often does not mean always. If building occupants are asleep during a CO poisoning hazard they could be asphyxiated without ever waking up. That is why it is really smart to have both working smoke detectors and working carbon monoxide detectors in your home.
How can I Check for or Test for Odorless Indoor Toxic Contaminants and Chemicals
OPINION: It is not cost-reasonable to try to test for every possible contaminant in a building, chemical or gas: there are just too many possibilities, and there not any simple inexpensive broad-spectrum "catch all" test.
See TOXIC GAS TEST PROCEDURES. Don't just make a "wild guess" and then just test for that contaminant - doing so may lead to a false sense of security while you may be ignoring a problem that was not detected because it was not looked-for.
Make a Quick Amateur Do-it-yourself Building Contaminant Risk Assessment
Therefore our approach is to decide when further investigation or action is needed (do we need to "hire an expert") based on an initial level of risk assessment:
Are there building-related occupant complaints? This is a subjective measure but it can be helpful to know if people appear to react with IAQ or health or respiratory complaints when they enter or spend time in a specific building or building area.
Is there visible evidence of something thought to be a concern, some building condition or building event that often leads to an indoor environment or air quality worry, such as evidence of leaks, mold remediation (was the cleanup performed correctly) or a radon mitigation system (is it working properly?)
Is there history of leaks from any source that have wet building materials or cavities (possible hidden mold)
Is there historical evidence that suggests a problem is highly likely though hidden
A history of building use and building occupants may disclose prior activities that produced or used unsafe products or chemicals (gases? probably dissipated)
A client bought a strip mall; we saw an abandoned trailer on the property - it had been used to store pesticides - turned out not to be a problem, as nothing had leaked;
But later the client called to say that four owners back a tenant had done metal plating and there was heavy metal cadmium contamination in some of the soil - DEC wanted it cleaned up. No one dreamed this problem was lurking, but a more extensive historical research of building occupants and uses might have raised this question by identifying a metal plating operation years before.
Is there visual evidence that suggests a problem by "indirect evidence"
A client was buying a house; we saw evidence of a history of termite damage but no evidence of professional treatment (drill holes around the perimeter of the concrete floor slab that had been capped); we did
see irregular, angled drill holes in floor framing near termite damage (possible unprofessional pesticide application); there was no record of professional pest control treatment; we took a sliver of wood from a sill plate for mailing to a test lab.
The lab confirmed that a now-banned pesticide, chlordane, had been liberally applied to wood surfaces. Possibly improperly. At a minimum, precautions during renovations were in order.
If there is evidence of a specific concern, or type of concern, then further testing may be in order.
If there is evidence of building related complaints, a visual inspection by an expert, combined with history taking about the occupants and the building, and possibly specific targeted tests, may be in order.
See PESTICIDE EXPOSURE HAZARDS.
Other examples of "indirect evidence" that can lead to important discoveries about conditions at a property are discussed at DEVELOPING YOUR X-Ray VISION
Other Building Hazards are Latent - Odorless, Colorless, Until an Event: Building Fire or Flood
Other indoor hazards are simply lurking, like a stair-fall: nothing happens until something else happens.
VINYL CHLORIDE HEALTH INFO discusses possible health concerns from PVC, dioxin, or HCL outgassing that occurs in vinyl building products (siding, windows, trim) are consumed in a fire (and possibly at lower levels from heating such as by sunlight).
Reader Question: Suspected Chemical Hazards in a Converted Industrial Space: Tetrachloroethylene exposure testing, hazards, MSDS
I got your website address from one of the Dutchess County health inspectors. He tried to help us but he could only test
for organic solvents. He said sorry when he could not find anything and told us we needed to hire a private company to do testing.
We moved into a newly converted industrial space at
[redacted for privacy] in Poughkeepsie. The building use to be a metal factory
for the last 60 years until they turned it into rental units. On the 5th day of working there I noticed a strange vapor in the air that
smelt like "welding" or something.
For about a month after that I was in like a zombie like state. When I felt to sick to go to work
and stayed home for a few days I snapped back to myself. Over those few days I was shaking like I was going through withdrawal or
something. I downloaded a list of hazard waste shipments that this metal company shipped out and my symptoms fit well with tetrachloroethene exposure
I called the health dept and they told me to go to the emergency room which they said the only treatment would be fresh air and rest. I guess the health dept
meet with the landlord and they were not able to find anything. One day a few days later I was there I could smell the stuff in the air that's when the inspector
meet with me and said they can only test for solvents.
I bought one of these Haz Mat smart strips
It tested positive for oxidizer
and the Cyanide test turned a funky color that is not on the chart.
The landlord is a large company based in Westchester they seem to not care. The keep saying to write down dates and times and get blood tests. They never return our calls We tried to
get blood tests but the doctor said we need to find out what we exposure to.
This nightmare has gone on for 2+ months my business is pretty much destroyed. I will be homeless in a month if someone does not help
Can you please help us pro-bono or on a payment plan
Thanks, R.S. - Poughkeepsie, New York
I am sorry to read of the difficulties you describe, and also to report that because my forensic expertise is with particles, mold, allergens, and not chemical contaminants, I'm not the best person to assist you. I agree that there could be chemical contaminants left from the prior industrial use of your building, including oils and solvents, and on an older building such as those along Cottage St. in Poughkeepsie, even pesticides.
Tetrachloroethene, also referred to as tetrachloroethylene or as "perc" was used in dry cleaning as well as a degreaser for metal working.
Watch out: while it is quite reasonable to suspect that tetrachloroethylene was and may remain present in a building where metalworking was conducted (used as a degreaser solvent that is both volatile and persistent in the environment), it would be a serious mistake to jump to the conclusion that it is the chief or only hazard in your building just as it would be risky to guess at your own exposure or to diagnose your complaint without consulting a qualified expert physician and hygienist.
Just as an example, depending on the kind of work performed, metal plating, for example, can leave other hazards such as cadmium or other heavy metals behind in a local environment.
Watch out: Similarly, the "Smart-Strip" test kit that you purchased is a warning badge intended for emergency responders not comprehensive building surveys for chemical hazards. It was developed by Mike Reimer and is sensitive to chlorine, abnormal pH levels (identifying highly acidic or highly caustic agents), Fluoride, some nerve agents, Oxidizers, Arsenic, Sulfides, and Cyanide. It is by no means intended as a broad spectrum analyzer to identify specific chemicals among the thousands that may be used among various industries and industrial processes.
This chemically reactive "badge" is intended to be used or worn by first responders and emergency workers in the field to make very broad identification of hazardous conditions. It is not intended to identify specific chemicals or contaminants. And while this badge is widely accepted as a rough hazard screen, with this or many other chemically-based tests for contaminants, the presence of some chemicals or gases will affect the detection of others.
In contrast, an expert building investigator will consider the history of use of the building, the site, even nearby sites, as well as actual onsite observations, and occupant interview results in choosing an approach to screening for specific hazards.
I'm not sure you have to identify the exact solvent or chemical for a physician to be of assistance. If s/he has experience in environmental medicine or can refer you to someone who has that experience, there are most likely somewhat more broad exposure tests to hydrocarbons, solvents, including the one you name.
I suggest contacting an industrial hygienist willing to work on residential exposure questions, or perhaps Paul Ciminello at Ecosystems Strategies. But I am doubtful that many others besides myself are willing to take work like this on a pro-bono basis. And expert services can be costly.
Watch out: In my OPINION the safe inhabitability of a building is the responsibility of the building owner, and more, that the building owners may be inadvertently accepting a very very large liability risk if they have not had the building adequately surveyed and assured safe for occupants.
If you make that concern clear, in writing, you may find that the owners will be willing to have proper inspection and testing performed. We can understand that an owner, not wanting to face or exacerbate what they may feel are avoidable expenses or troubles, may hope to find someone who will be quick, cheap, and who will give a clean bill of health to the building.
But the risks of sloppy, careless or superficial work are so great for both owners and occupants, that in my view that would be a dangerous approach, and one to be avoided.
If you think it will assist your building owners in deciding what action is appropriate, when you write to them (phone calls alone are not adequate if serious building risks are suspected) you can include a copy of our correspondence, along with your own description of your concerns, along with
the NEW YORK STATE file about TETRACHLORETHYLENE EXPOSURE [PDF]
the TETRACHLORETHYLENE MSDS [PDF] that I attached to my email to you and link-to here.
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.
Thanks to reader Jacqueline Saenz for discussing concerns of both noticeable indoor odors and worry about remaining unsafe chemicals or products that do not smell. 4/12/2010
"Fish Tale", Diagnosis: Lisa sanders, MD, New York Times Sunday Times Magazine 4/11/2010, reported on a case of of ciguatera poisoning following consumption of contaminated barracuda shark flesh while visiting the Bahamas. The case was diagnosed by Dr. Kurtland Ma.
ASTM E2600 - 08 Standard Practice for Assessment of Vapor Intrusion into Structures on Property Involved in Real Estate Transactions is available from the ASTM at astm.org/Standards/E2600.htm .
"This practice is intended for use on a voluntary basis by parties who wish to conduct a VIA on a parcel of real estate, or more specifically conduct a screening evaluation to determine whether or not there is potential for a VIC, and if so, identify alternatives for further investigation."
The standard goes on to emphasize the uncertainty in testing any site for gases and vapor intrusion.
Kansas State University, department of plant pathology, extension plant pathology web page on wheat rust fungus: see http://www.oznet.ksu.edu/path-ext/factSheets/Wheat/Wheat%20Leaf%20Rust.asp
"A Brief Guide to Mold, Moisture, and Your Home",
U.S. Environmental Protection Agency US EPA - includes basic advice for building owners, occupants, and mold cleanup operations. See http://www.epa.gov/mold/moldguide.htm
US EPA - Mold Remediation in Schools and Commercial Building [ copy on file as /sickhouse/EPA_Mold_Remediation_in_Schools.pdf ] - US EPA
US EPA - Una Breva Guia a Moho - Hongo [on file as /sickhouse/EPA_Moho_Guia_sp.pdf - - en Espanol
"IgG Food Allergy Testing by ELISA/EIA, What do they really tell us?" Sheryl B. Miller, MT (ASCP), PhD, Clinical Laboratory Director, Bastyr University Natural Health Clinic - ELISA testing accuracy: Here is an example of Miller's critique of ELISA
http://www.betterhealthusa.com/public/282.cfm - Townsend Letter for Doctors and Patients
The critique included in that article raises compelling questions about IgG testing assays, which prompts our interest in actually screening for the presence of high levels of particles that could carry allergens - dog dander or cat dander in the case at hand.
http://www.tldp.com/issue/174/IgG%20Food%20Allergy.html contains similar criticism in another venue but interestingly by the same author, Sheryl Miller. Sheryl Miller, MT (ASCP), PhD, is an Immunologist and Associate Professor of Basic and Medical Sciences at Bastyr University in Bothell, Washington. She is also the Laboratory Director of the Bastyr Natural Health Clinic Laboratory.
Allergens: Testing for the level of exposure to animal allergens is discussed at http://www.animalhealthchannel.com/animalallergy/diagnosis.shtml (lab animal exposure study is interesting because it involves a higher exposure level in some cases
Allergens: WebMD discusses allergy tests for humans at webmd.com/allergies/allergy-tests
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