❋ Detoxcellence

New-Car Interior Off-Gassing

That 'new car smell'.

65Low burden · out of 100

Cleaner swapVentilate; park in shade; air it out for weeks

How this score is built

100Start
86.2Chemical hazard 3 × 4.6−13.8
72.6Everyday exposure 4 × 3.4−13.6
65Persistence 3 × 2.6−7.8, then rounded to 65
LowThe band65 sits in 60–79.

What each input rests on

The three ratings behind the score, and the studies each rests on
Input	Rating	Evidence
Chemical hazard	3/10	unsourced input
Everyday exposure	4/10	Silicone samplers hung for 7 days in 101 US vehicles of model year 2015 or newer detected the flame retardant TCIPP in 99%; levels were 2 to 5 times higher in summer than in winter, and higher where the seat foam contained TCIPP. Flame Retardant Exposure in Vehicles Is Influenced by Use in Seat Foam and Temperature · Environ Sci Technol 2024 DOI 10.1021/acs.est.3c10440 · PMID 38712863 · Abstract · read 2026-10-21
Persistence	3/10	In one new car tracked for over three years, 162 organic compounds were identified and total VOCs were about 14 mg/m³ the day after delivery; they fell to about a tenth by the next summer, rose with cabin temperature, and still exceeded a 300 µg/m³ indoor guideline in summer throughout the study. A case study on identification of airborne organic compounds and time courses of their concentrations in the cabin of a new car for private use · Environ Int 2006 DOI 10.1016/j.envint.2005.04.009 · PMID 15993490 · Abstract · read 2026-10-21

Ratings are editorial. A study listed here supports the rating; it did not compute it. How the index is built

What this means for you

The smell is VOCs and flame retardants off-gassing from plastics and adhesives, worse in heat. Ventilate generously for the first months.

Evidence strength: moderate

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