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In a study of six residential dryer vents, the highest d-limonene concentration measured in vent air was 118 μg/m³ (mean 33.34 μg/m³) in households using fragranced laundry detergent and 0.26 μg/m³ (mean 0.25 μg/m³) in households using only fragrance-free detergent.
Six households near Melbourne, Australia, all using the same two study detergents, one fragranced and one fragrance-free liquid laundry detergent: four used the fragranced one and later switched, two used only the fragrance-free one, and the fragranced values are from before the switch. One-hour samples of dryer-vent air from the start of drying, analysed for d-limonene only. Emission composition, not the smell of detergent; d-limonene is not named as the cause of a detergent's scent; not every detergent; the study's health conclusions are outside this claim.EXTERNAL RECORD