Every fact on this site, with its evidence grade, its caveats, and a link to the source.
We start you on the strong ones: findings that have been replicated or come from one large, well-controlled study. Moderate and weak facts are here too, labeled for what they are. Use “Link to this fact” to share a single card.
Fragrance is everywhere / Measured in people or real products
General-population blood styrene levels (US NHANES, general adult population) run in the range of roughly 0.02-0.2 nanograms per milliliter (50th to 95th percentile across several 1988-2008 survey cycles) — two to three orders of magnitude below levels reported in occupationally exposed reinforced-plastics or rubber workers.
Strong evidence: NHANES biomonitoring data; does not by itself establish health risk at these levels, only relative exposure magnitude versus occupational cohorts.
Source: IARC 2019 (Vol. 121) Link to this fact
Fragrance is everywhere / Review of other studies
Of 83 chemicals the EPA had flagged as priorities for safety review (TSCA Work Plan), 65 (over 80%) were known to be in consumer products.
Moderate evidence: Not fragrance-specific.
Source: Goldsmith 2014, Food and Chemical Toxicology Link to this fact
Fragrance is everywhere / Measured in people or real products
A silicone ingredient in everyday deodorants, lotions, and hair products (D5) shows up in city outdoor air on a clear morning schedule tracking when people shower and dress for work, peaking around 6-7 AM and fading over the following several hours.
Moderate evidence.
Caveats
Diurnal emission-rate profile derived for one mid-sized US city (Boulder, CO, winter 2015/2017); Toronto ground-site data (2009) show a similarly timed morning peak in concentration, but the emission-rate model itself is Boulder-only.
Source: Coggon 2018, Environmental Science & Technology Link to this fact
Fragrance is everywhere / Hypothesis
Immigrant women in the US most often work as house cleaners and make up 71% of manicurists; an expert job-exposure tool rates both jobs as probably exposed to fragrance chemicals, and house cleaning also to cleaning-product ingredients such as alkylphenols and antimicrobials.
Weak evidence: Exposure ratings from job descriptions (WORC), not measurements.
Source: Knox 2026, Journal of Exposure Science & Environmental Epidemiology Link to this fact
Information, not medical advice. See also: myths we won’t tell you.