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.
Health effects / Hypothesis
Silent Spring Institute researchers name house cleaners and nurses as priority jobs for cutting exposure to fragrance, cleaning, and personal-care chemicals linked to breast cancer in lab and animal studies.
Weak evidence: No exposure or cancer data in these workers.
Source: Knox 2026, Journal of Exposure Science & Environmental Epidemiology Link to this fact
Health effects / Review of other studies
Many everyday chemicals, including some released by scented and cleaning products, act on the same irritant-sensor nerves in the nose and airways (TRPA1 and TRPV1), one reason very different products can cause similar symptoms.
Weak evidence: Mechanism largely from lab/animal studies; dose relevance to homes untested.
Source: Molot 2023, Neuroscience and Biobehavioral Reviews Link to this fact
Health effects / Review of other studies
Frequent private use of household disinfectants (a composite of methods including hand-wash, machine, sponge, and spray disinfection) was linked to close to a threefold increase in the odds of newly developing asthma in a single cross-sectional wave of young German adults (Weinmann 2017, OR 2.79, 95% CI 1.14-6.83); the evidence for household sprays alone driving that same result was already weak in that wave (OR 2.79, 95% CI 0.84-9.20), and a 10-year longitudinal follow-up of the same cohort (Pacheco Da Silva 2025) found no significant association between persistent spray-only use and current asthma or wheeze (point estimates at or below 1.0 for every outcome), with only a non-significant, attenuated OR of 1.68 (95% CI 0.48-5.88) for sustained use of multiple disinfectants/cleaning products together.
Weak evidence.
Caveats
Two analyses of the same German SOLAR cohort (Weinmann 2017's cross-sectional SOLAR II wave, and Pacheco Da Silva 2025's 10-year longitudinal follow-up adding SOLAR III with latent-class exposure profiles) now agree that spray-specific use is not significantly associated with adult asthma. The only positive signal across both papers is a composite 'persistent use of multiple DCPs' profile, which itself weakened from a significant OR 2.79 (single wave, simple frequency composite) to a non-significant OR 1.68 (10-year follow-up, latent-class model, wide CI 0.48-5.88). Both papers are single-cohort, self-reported-exposure studies from the same research group, so per the grading rule this stays below moderate. The follow-up nulls are underpowered (1,143 of the original 2,051; only ~8-12% in each persistent-use profile; CIs span roughly 0.5-6), so they weaken the claim without refuting it. Other cohorts not yet in our evidence base reported positive spray-asthma associations (ECRHS, Zock 2007; French EGEA, Pacheco Da Silva 2023); don't cite this cohort as evidence that sprays are safe.
Source: Salonen 2024, Environment International Link to this fact
Health effects / Self-reported survey
In a 10-year longitudinal follow-up of a German young-adult cohort (SOLAR, n=1,143), only participants who persistently used multiple disinfectants and cleaning products (sprays, disinfectant sprays, and nonspray disinfection methods) weekly at two assessments 10 years apart showed an elevated point estimate for current asthma (OR 1.68) and current wheeze (OR 1.71) compared with no weekly use; neither reached statistical significance (95% CI 0.48-5.88 and 0.75-3.90).
Weak evidence.
Caveats
Same underlying cohort as Weinmann 2017 (SOLAR 2 exposure data reused); small persistent-use subgroup (8.2% of n=1,143); wide confidence intervals; incident-asthma/wheeze estimates too imprecise for inference; authors draw no causal conclusion.
Health effects / Measured in people or real products
In the same chamber study, particles formed when the citrus fragrance chemical d-limonene reacted with ozone tended to shift that same heart-rhythm marker in the opposite direction from candle smoke, at particle levels similar to everyday cleaning or air-freshener use.
Weak evidence.
Caveats
This tendency was not statistically significant on its own versus clean air (HF -7.2%, p=0.41); only its difference from candle smoke's opposite-direction change reached significance (p=0.02, 12-subject paired comparison). Not replicated.
Source: Hagerman et al. 2014, Atmospheric Environment Link to this fact
Health effects / Other evidence
The TVOC and PM2.5 increases measured after cleaning in this study (up to about 104 ppbv and 14.5 micrograms per cubic meter) fall at the lower end of ranges reported elsewhere for cooking (10-560 ppbv, 0.3-480 micrograms per cubic meter) and smoking (up to 600 ppbv, up to 253 micrograms per cubic meter).
Weak evidence.
Caveats
The cooking/smoking numbers are secondhand citations from other studies, not measurements from this paper, and the authors note their own small-surface controlled experiments likely understate real-world cleaning exposure (e.g., multiple surfaces cleaned in succession, as in the hotel).
Source: Souza 2025, ACS Earth Space Chem, ACS Earth and Space Chemistry Link to this fact
Health effects / Other evidence
At this Belgian center, cleaning-agent challenges were 3.2% of all work-asthma challenges in 1992-2001 and 8.6% in 2002-2011, and 16 of the 17 positive reactions came from the later decade.
Weak evidence: Share of referrals at one center, not incidence; referral patterns, awareness and QAC use may have changed. Authors call it only 'some suggestion' of an increase.
Health effects / Review of other studies
EWG said that about 53 percent of the cleaning products it assessed contain ingredients known to harm the lungs and about 22 percent contain chemicals reported to cause asthma to develop.
Weak evidence: Hazard flags from databases on an unspecified product set, not exposure or effect measures from product use; denominators and databases not named.
Source: EWG press release, Sept. 10, 2012, EWG press release (web page) Link to this fact
Health effects / Other evidence
In rodent studies of a hydrocarbon dry-cleaning solvent (Stoddard Solvent IIC), adrenal tumors appeared in male rats, liver adenomas in female mice were equivocal, and sperm motility fell at 550 milligrams per cubic meter in rats and 2200 in mice.
Weak evidence.
Caveats
Animal data for a related solvent with higher aromatic content (0.58-0.93%) than the 0.1% or less reported for the DC-142 product; the report uses it as a stand-in; current high-flash solvents are not directly tested.
Source: SCDHS 2018 Link to this fact
Health effects / Measured in people or real products
Only 2 of 69 irritant-induced asthma cases in a Finnish clinic series were cleaners; the authors suggest cleaning work involves long-term low-level irritant exposure that does not meet the criteria for irritant-induced asthma.
Weak evidence.
Caveats
Single-center retrospective case series; industrial workplaces, not households; no control group. The authors' interpretation, not tested; a clinic series cannot show how often cleaning products cause irritant asthma.
Source: Lindström 2021, Occupational and Environmental Medicine Link to this fact
Health effects / Other evidence
Studies in the panel's tables link accidental mixing of bleach with other cleaning products to higher asthma odds in cleaners: about 3.8 times in domestic cleaning women (95% CI 1.0-14) and 2.3 times in cleaning workers (95% CI 1.0-5.5).
Weak evidence: Small studies with very wide confidence intervals, self-reported incidents and recall bias; the paper notes reporting bias could not be excluded in the larger European cohort.
Information, not medical advice. See also: myths we won’t tell you.