ErgoChair Pro vs West Elm Humanscale World LM Task Chair: which is safer?
West Elm Humanscale World LM Task Chair is our pick: better on PFAS and on the overall hazard picture.
Autonomous
ErgoChair Pro
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
LikelyFlame-retardant chemicals in upholstery fabric
PossibleFormaldehyde-releasing resins in fabric finish and adhesives
PossibleVolatile organic compounds (VOCs) from off-gassing
Our pick
Humanscale
West Elm Humanscale World LM Task Chair
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleFormaldehyde in fabric finishes and dyes
PossibleAzo dyes and other dye-related allergens
PossibleFabric antimicrobial or water-repellent treatment (undisclosed)
Where these two actually differ
- We flag Flame-retardant chemicals in upholstery fabric, Formaldehyde-releasing resins in fabric finish and adhesives and Volatile organic compounds (VOCs) from off-gassing on the Autonomous and not on the Humanscale.
- We flag Formaldehyde in fabric finishes and dyes, Azo dyes and other dye-related allergens and Fabric antimicrobial or water-repellent treatment (undisclosed) on the Humanscale and not on the Autonomous.
- The Autonomous is Steel frame, upholstered fabric seat/back, plastic/aluminum components where the Humanscale is aluminum frame, foam cushioning, mesh/upholstery fabric, which is most of the difference in these two grades.
- These two are level, close enough that price and fit should decide it rather than our grade.
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More office chairs: see the full ranking