Large Artificial Trees Low Emission Materials David Hurtado Oct 14, 2026 Table of Contents An architecture firm finishing out a LEED v4 office lobby called us two weeks before occupancy with a straightforward problem: the mechanical engineer had signed off on the HVAC balancing, the paint and adhesives on the submittal log carried GREENGUARD paperwork, and the only item without a documented emissions profile was the pair of two-story large-format feature trees slated for the atrium. The general contractor did not want anything shipped onto a sealed, newly conditioned floor that might off-gas into air the building was about to recirculate for the first time. The facilities team asked a fair question: what is actually inside a manufactured tree that could affect indoor air, and how do we get paperwork on it before the crane lift is scheduled? That question comes up on almost every specification where artificial greenery, whether a feature tree in an atrium or a grouping of potted plants and planters along a reception desk, shares air volume with occupants from day one. Unlike a chair or a carpet tile that a facilities team can air out in a warehouse, a tree is often built, wrapped, and shipped directly to a finished space, so emissions questions need answers at the specification stage, not after delivery. Where Emissions in Artificial Trees Actually Come From A manufactured tree is an assembly of several distinct material systems, and each one carries its own emissions profile. Treating the whole product as a single line item on a spec sheet misses where the actual chemistry sits. Leaf polymer: Leaves are typically molded or cut from polyethylene (PE), polyvinyl chloride (PVC), or fabric blends. PE generally carries a lower VOC load than PVC, which can release plasticizers and stabilizers as it cures and ages.Trunk and branch cores: Foam fill, polyurethane coatings, and resin-wrapped wire armatures are common structural cores. Foam formulations vary widely in residual isocyanate and blowing-agent content.Adhesives and bonding agents: The glues that attach individual leaves to branches and branches to a trunk are applied in high volume relative to the finished weight of the tree, so adhesive chemistry has an outsized effect on total emissions.Flame-retardant treatments: Fire-retardant finishes required for most commercial interior specifications are chemically active coatings, and the carrier solvents used to apply them can contribute to short-term off-gassing if not fully cured before shipment.Dyes and surface coatings: UV-stable dyes and clear topcoats used to hold color and sheen on bark and foliage can include solvent carriers that off-gas during the first weeks after unpacking. Most of the odor complaints facilities teams report in the first month after installation trace back to one of these five sources, usually adhesive or coating solvents that had not fully cured before the product left the factory floor. Certifications and Test Standards Specifiers Can Request Because a tree is not a single material, no single certification covers every component automatically. Specifiers who want a documented emissions profile typically ask for one or more of the following, matched to the sensitivity of the space. StandardWhat It MeasuresWho Typically Requires ItRelevant Tree Components UL GREENGUARD CertificationTotal VOC emissions tested against health-based chamber limitsGeneral commercial interiors, office tenant improvement specsLeaf coatings, trunk coatings, adhesives UL GREENGUARD GoldStricter VOC limits aligned with CDPH Standard Method v1.2, including child-occupied space thresholdsSchools, healthcare, hospitality lobbiesFull assembly, including foam cores and dyes CDPH Standard Method v1.2 (Section 01350)Chamber-tested emissions of individual VOCs plus total VOC load over timeLEED v4 Low-Emitting Materials credit, California public projectsFoam, adhesives, flame-retardant treatments CARB Phase 2 / TSCA Title VIFormaldehyde emissions from composite wood componentsAny project specifying wood-based trunk or base substratesWood or wood-composite trunk cores and bases None of these standards were written with artificial greenery as the primary use case, which is exactly why specifiers need to ask which parts of an assembly a given test report actually covers before assuming full coverage. Requesting Low-Emission Documentation Before You Specify The project above got resolved by asking three direct questions of the manufacturer rather than relying on a generic marketing claim of being low-odor. Ask for the chamber test report, not just a certificate: A certification logo confirms a product passed, but a chamber test report shows which components were tested and what the measured VOC concentrations were, which matters when a reviewing engineer wants the underlying data.Ask which sub-assemblies were included in testing: A report covering only the leaf material does not speak to the trunk foam or the adhesive bonding it, so confirm scope before citing the document on a submittal.Ask about pre-shipment conditioning: Some manufacturers hold finished trees in a ventilated staging area for a set period after assembly so the bulk of short-term off-gassing happens before the product reaches the jobsite rather than after.Ask for a safety data sheet on the adhesive and flame-retardant chemistries specifically: These two line items drive most measurable emissions, so a facilities manager reviewing a submittal usually wants them called out separately from the general product cut sheet. Projects with unusual occupancy conditions, a tight color match, or a scale that falls outside standard product lines often route these questions through a direct request rather than a catalog page. Our dedicated rep for custom inquiries is the fastest way to get chamber test reports and sub-assembly documentation attached to a specific project before bid. Material and Adhesive Choices That Reduce Emissions A handful of manufacturing choices consistently separate a low-emission assembly from a conventional one, and they are worth knowing before a submittal review rather than after. Water-based adhesives over solvent-based ones: Water-based formulations cure with a far smaller VOC release than traditional solvent adhesives, though they can require longer open time during assembly.Powder or UV-cured coatings over solvent-carried dyes: Coatings that cure under UV light or as a dry powder leave almost no residual solvent compared to a sprayed, solvent-carried finish.Polyethylene leaf stock where color and texture allow it: PE generally off-gasses less than PVC, so specifying PE where the design intent permits it reduces the total emissions load without changing the visual result in most applications.Pre-cured flame-retardant application: Treating foliage and foam components with flame retardant early in production, then allowing full cure time before final assembly, keeps solvent carriers from off-gassing inside the finished tree after it ships. Material sourcing, including how much recycled content ends up in trunk cores and planter bases, is a related factor in a tree’s full material profile, though it is a separate question from how a material emits once installed. On emissions specifically, the manufacturing choices above are what move the needle. Projects that need a documented, project-specific material path, whether for a color match, a trunk diameter outside standard offerings, or a certification combination unique to one building, typically start with our custom material and finish process rather than a stock catalog listing. UL administers its own certification testing and chamber methodology independently of individual manufacturers, screening finished products against thousands of individual VOCs rather than a handful of compounds, which is why reviewing engineers treat a GREENGUARD Gold report as stronger evidence than a general low-odor claim. Conclusion Low emission materials are not a single spec line on an artificial tree; they are a set of decisions spread across leaf polymer, trunk core, adhesive, flame-retardant treatment, and surface coating, each with its own chemistry and its own test method. A manufacturer that can hand over a chamber test report scoped to the actual sub-assemblies in a tree, rather than a single certification logo, gives a specifier something a reviewing engineer can actually act on. For sealed, newly conditioned spaces where occupants move in before a building has had time to breathe, that documentation is often the difference between a smooth close-out and a greenery line item that gets flagged late in the process. FAQ Do artificial trees off-gas after installation? Some do, particularly if adhesives, flame-retardant treatments, or surface coatings were not fully cured before the product shipped. Asking for a pre-shipment conditioning period and a chamber test report on the adhesive and coating chemistries specifically reduces this risk. Which certification should we request for a LEED project? CDPH Standard Method v1.2 (Section 01350) documentation is what LEED v4’s Low-Emitting Materials credit references directly, so that is the report to request first. UL GREENGUARD Gold certification, which aligns with the same chamber limits, is also commonly accepted. Are fire-retardant treatments a source of emissions? They can be, depending on the carrier solvent used to apply the treatment and how fully it cures before the product ships. A manufacturer that pre-cures flame-retardant treatments early in production, rather than applying them right before shipment, typically shows a lower measured VOC load. Can we get third-party test reports before we order? Most manufacturers that maintain GREENGUARD or CDPH certification can provide the underlying chamber test report, not just the certificate, if asked directly during the specification phase rather than after an order is placed. Do smaller potted plants and planters need the same scrutiny as large trees? The same material categories, leaf polymer, foam or structural core, adhesive, and coating, apply at any scale, but the total mass of material in a large feature tree means its total emissions contribution to a room is proportionally higher, which is why larger pieces tend to get more documentation attention on a submittal log.