GreenGuard certification

10 08 2011

GreenGuard was launched in 2000 by Atlanta-based for-profit Air Quality Sciences (AQS), which is now a separate not-for-profit organization. Although GreenGuard was not designed specifically for fabrics, it is often advertised that a fabric is GreenGuard certified, because GreenGuard certified products can automatically meet the requirements of LEED 2009 CI Credit 4.5 and BIFMA X7.1.

GreenGuard has developed proprietary indoor air-quality pollutant guidelines based on standards developed by the government and by industrial bodies.  Maximum allowable emission levels in air concentrations, according to their website,  are based on those required by the state of Washington‘s indoor air quality program for new construction, the U. S. EPA’s procurements specifications, the recommendations from the World Health Organization, Germany’s Blue Angel Program,  LEED for New Construction (LEED-NC) and LEED for Commercial Interiors (LEED-CI).

GreenGuard  has introduced a special certification, called GreenGuard Children and Schools,  which is intended to be applied to products which are used in schools, daycares, healthcare facilities, and places where sensitive adults may reside or work.  This certification is necessary because, as they say on their website, “children are more sensitive to environmental exposures than adults. Their bodies are still developing including their brains. They breathe faster than adults and in return receive a higher dose of indoor pollution per body weight. To account for inhalation exposure to young children, a body burden correction factor has been applied to the current GREENGUARD Indoor Air Quality Certified® allowable levels.”

Those products that pay the testing fee and pass muster earn the right to call themselves GreenGuard certified.  The GreenGuard Product Guide has become a purchasing tool for thousands of specifiers as they depend on it to preselect environmentally preferable products.

In order to become certified, all products are tested in dynamic environmental chambers following test methods as posted on the GreenGuard Environmental Institute (GEI)  web site.   The tests are designed to measure emitting chemicals coming from a product; that means it tests only for evaporating chemicals –  chemicals which are a gas at room temperature.  Specifically, for the GreenGuard certification, emission criteria are established for total Volatile Organic Compounds (TVOC), formaldehyde, total aldehydes, all individual chemicals with currently published Threshold Limit Values (TLVs), respirable particles and certain odorants and irritants.  The requirements for Children and Schools is more stringent and includes limits on emissions for total phthalates,  consisting of dibutyl (DBP), diethylhexyl (DEHP), diethyl (DEP), dimethyl (DMP), butylbenzyl (BBP) and dioctyl (DOP) phthalates, because, again according to the GreenGuard website, “Results from recent research indicate that inhalation is an important route of exposure to phthalates and that these chemicals have been associated with endocrine disorders, reproductive and developmental disorders, asthma and allergies.”

GreenGuard, by measuring only emitting chemicals, is significant for what it does not measure:

  • It does not measure any of the heavy metals (lead, mercury, copper, etc.), such as those used in fabric dyestuffs, because they are not emitted at standard indoor air conditions;
  • It does not measure PVC,  which is a polymer and therefore not volatile (however, some PVC based product types have a special formulation which enables them to meet GreenGuard standards);
  • It does not measure phthalates  except in the Children and Schools certification; phthalates are semi volatile, and don’t begin to evaporate until approximately 7 days after exposure to the air.
  • It does not evaluate the manufacture of a product, nor any byproducts created during production or disposal
  • It does not evaluate any social justice issues
  • It does not evaluate carbon footprint issues

Nobody can debate that we need to rid the indoor environment from irritating contaminants that can have serious effects on people’s health, productivity and quality of life.  Since

Americans spend 90 percent of their time indoors, and indoor air can be as much as 100 times more polluted than outdoor air, this issue must be taken seriously by designers.  It is incumbent on them to specify products (including fabrics) that are low-emitters of formaldehyde and all the other volatile organic compounds that contribute to poor indoor air.  But it is also true that air quality is not the only contributor to poor health, productivity and quality of life of the occupants of indoor spaces – after all, our skin is the largest organ in our bodies, and it’s quite permeable.  So designers should not take this certification as assurance that a product is the best environmental choice – not only does it bypass those chemicals that do not evaporate, it does not look at the production of the fabric, any social justice issues, nor does it look at carbon footprint.  Indeed, a product containing PVC, one of the most toxic substances known – highly toxic in all its phases: manufacture, use, and disposal – can be  GreenGuard certified.

According to GreenGuard itself, as is published on their web site:  GreenGuard is a product emissions performance-based standard, and as such, the complete toxicity effects of the chemical emissions from the products tested are beyond its scope.

So what are the take aways?  Remember that GreenGuard tests for emitting chemicals only, and they do that very well.   But it should not be used as a tool to evaluate a product’s environmental impact and safety.


Volatile Organic Compounds (VOCs)

17 03 2010

What are Volatile Organic Compounds (VOC’s) that we hear so much about?

Simply, they are chemicals which are carbon-based (hence the “organic” in the name, as organic chemistry is the study of carbon containing compounds) and which volatilize – or rather, evaporate or vaporize – at ordinary (atmospheric) temperatures.  This is a very broad set of chemicals!

These volatile organic compounds (VOC’s) are ubiquitous in the environment.  You can’t see them, but they’re all around us.  They’re not  listed as ingredients on the products you bring home, but they’re often there.   The most common VOC is methane, which comes from wetlands and rice agriculture to …well, “ruminant gases” (or cow farts – which are actually not a trivial consideration:  cows are responsible for 18% of all greenhouse gasses – read more here).  We ourselves contribute to CO2 emissions each time we breathe out.  They’re also in paint, carpets, furnishings, fabrics and cleaning agents.

The evaporating chemicals from many products contribute to poor indoor air quality, which the U.S. Environmental Protection Agency estimates is two to five times worse than air outside – but concentrations of VOC’s can be as much as 1,000 times greater indoors than out.  These chemicals can cause chronic and acute health effects, while others are known carcinogens.   Hurricane Katrina proved a lesson in what happens when we don’t pay attention to indoor air quality:  The trailers which were provided to refugees of Katrina proved, in a test done by the Centers for Disease Control and Prevention, to have formaldehyde levels that were 5 times higher than normal; with some levels as high as 40 times higher.  Other airborne contaminants were found to be present.  The result? This is from Newsweek, November 22, 2008:

”  …the children of Katrina who stayed longest in ramshackle government trailer parks in Baton Rouge are “the sickest I have ever seen in the U.S.,” says Irwin Redlener, president of the Children’s Health Fund and a professor at Columbia University’s Mailman School of Public Health. According to a new report by CHF and Mailman focusing on 261 displaced children, the well-being of the poorest Katrina kids has “declined to an alarming level” since the hurricane. Forty-one percent are anemic—twice the rate found in children in New York City homeless shelters, and more than twice the CDC’s record rate for high-risk minorities. More than half the kids have mental-health problems. And 42 percent have respiratory infections and disorders that may be linked to formaldehyde…”

There is no clear and widely supported definition of a VOC.   Definitions vary depending on the particular context and the locale.  In the U.S., the EPA defines a VOC as any compound of carbon (excluding carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates  and ammonium carbonate)  which reacts with sunlight to create smog  –   but also includes a list of dozens of exceptions for compounds “determined to have negligible photochemical reactivity.” 

Under European law, the definition of a VOC is based on evaporation into the atmosphere, rather than reactivity, and the British coatings industry has adopted a labeling scheme for all decorative coatings to inform customers about the levels of organic solvents and other volatile materials present. Split into five levels, or “bands”, these span minimal, low, medium, high, and very high.

These differences in definition have led to a lot of confusion.  Especially in the green building community, we think of VOCs as contributors to indoor air quality (IAQ) problems—and the amount of VOCs is often our only IAQ metric for a product. But there are lots of compounds that meet a chemist’s definition of VOC   but are not photoreactive (as in the EPA definition)  so are not defined as VOCs by regulators. Some of these chemicals—including formaldehyde, methyl chloride, and many other chlorinated organic compounds—have serious health and ecological impacts.  Manufacturers can advertise their products as being “low-VOC” – while containing extremely toxic  volatilizing chemicals, such as perchloroethane in paint, which is not listed as a VOC by the EPA and therefore not required to be listed!

The Canadian government  (bless em) has an extensive list of which chemicals are considered VOC’s and you can access it here.  When products are identified as to which might contain VOC’s, furnishings are often cited and formaldehyde is the chemical highlighted, because it’s the chemical used most widely in fabric finishes.  However, there are many other chemicals on the list which are used in textile production, such as benzenes and benzidines;  methylene chloride, tetrachloroethylene, toluene and pentachlorophenol.

Some manufacturers advertise the amount or type of VOC in their products – and that may or may not be a good indication of what is actually released into the air, because sometimes these chemicals morph into something new as they volatilize.  The key word to remember is: reactive chemistry.  The chemicals don’t exist in a vacuum – heat, light, oxygen and other chemicals all have an effect on the chemical.

VOC’s are also found in our drinking water – the EPA estimates that VOC’s are present in 1/5 of the nation’s water supplies.  They enter the ground water from a variety of sources  – from textile effluents to oil spills.  The EPA lists VOC’s currently regulated in public water supplies (see that list here); they have established a maximum contaminant level (MCL) for each chemical listed.  But little is known about the additive effects of these chemicals.

Another point to remember is that the evaporation doesn’t happen in a pouf!  Chemicals evaporate over time – sometimes over quite long periods of time.  The graph below is of various evaporating chemicals at ground zero (GZ)  of the World Trade Center after the September 11 attacks:

For indoor air quality purposes we should look to results from chamber testing protocols that analyze key VOC’s individually.  Most of these protocols – such as California’s Section 01350, GreenGuard for Children and Schools, Indoor Advantage Gold and Green Label Plus – reference California’s list of chemicals for which acceptable exposure limits have been established.  But even this is not a comprehensive list.

Indoor air quality is certainly important, but in the case of fabrics there are many chemicals used in production which do not volatilize and which are certainly not beneficial to human health!  These include the heavy metals used in dyestuffs and many of the polymers (such as PVC).  So VOC considerations are just one part of the puzzle in evaluating a safe fabric.