Don’t take our word for it. Here’s every fact on this site, with its evidence grade, its caveats, and a link to the source, so you can check us.
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.
Indoor air / Measured in people or real products
In a week-long study of 7 working adults in Leipzig, the air at home made up 42-73% of the airborne chemicals they breathed, more than the outdoor air or their workplaces.
Weak evidence: N=7, one week, 25 VOCs; home share includes infiltrated outdoor air.
Source: Gokhale 2008, Science of the Total Environment Link to this fact
Indoor air / Other evidence
Baking soda raised the pH of the waste liquid from about 6 to 8.0-8.2 and lowered volatile acids by 17-23%, yet ammonia in the liquid rose (270 to up to 330 mg/L), so a deodorizer that cuts perceived odor can still shift which smelly chemicals are present.
Weak evidence: Ammonia was measured in the liquid, not the air, and the authors' argument that little of it evaporates at pH 8.2 is unmeasured reasoning.
Source: Qamaruz-Zaman 2015, Waste Management Link to this fact
Indoor air / Other evidence
CTV reported, from her letters, that indoor cigarette and cannabis smoke moved through her building's ventilation, that more chemical cleaners were used in hallways, and that she sealed her bedroom vents and lived mostly in that room.
Weak evidence.
Caveats
Her account via CTV; the Salvation Army, her landlord, replied only "we have nothing further to add" to her allegations. No air measurements. Death by MAiD is the subject; add 988 line in published use.
Source: CTV News, April 2022 (via Smoke-Free Housing BC; redacted copy), CTV News (news article) Link to this fact
Indoor air / Other evidence
The authors advised limiting ozone and reactive scent chemicals such as pine and citrus oils in cleaners, maintaining ozone-emitting copiers, and discouraging ozone 'air cleaners' for odor removal.
Weak evidence: Precautionary advice from the authors on mouse data and no human exposure test at the time; the paper says human studies are needed to set levels.
Source: Wolkoff 2000, Indoor Air Industry-funded Link to this fact
Indoor air / Other evidence
Personal-use scented products (perfumes, colognes, hair treatments) release their ozone-reactive chemicals close to the breathing zone, so inhaled doses of the reaction products can be larger than room-average models predict.
Weak evidence: A single supporting chamber citation, stated as a qualitative point; no dose given here.
Source: Weschler 2006, Environmental Health Perspectives Link to this fact
Information, not medical advice. See also: myths we won’t tell you.