On a typical day, you might engage in activities like washing your hair, using deodorant, drinking coffee, and commuting to work. These routine moments often expose people to various chemicals. While chemicals form the entire physical world, exposure levels, timing, and circumstances can influence health.
Most everyday exposures are low, and many products are designed with safety. Yet the real concern arises when multiple low-level exposures overlap. This should prompt a consideration of the combined health effects.
Mixtures Are Common
Research into individual chemical health effects has advanced hazard identification and regulation. However, single exposure is rare. Air is a mix of particles, gases, and vapors. Indoor air may vary due to cooking, cleaning, building materials, and ventilation.
A picture of an air monitoring station in Reno, Nevada captures this blend of pollutants. Photo by brewbooks/Flickr via Wikimedia Commons/CC BY-NC-SA.
Food contains pesticide residues, as detected in European and American monitoring programs. Crops might face exposure to multiple pesticides. Household products add to this layer of exposure, especially cosmetics and cleaning products containing fragrances and preservatives that researchers link to hormone disruption and asthma.
Even treated drinking water might contain contaminants from pharmaceuticals and industrial chemicals. Studies have found hormone-disrupting compounds in the U.S. water supply.
Challenges of Predicting Effects of Combinations
Chemicals in mixtures often act additively, enabling risk prediction. But they don’t always behave predictably. Sometimes they amplify each other’s effects or counteract each other, complicating risk assessments.
Hormone-active chemicals demonstrate this complexity. Hormones regulate essential functions via the endocrine system. Endocrine disruptors can interfere with hormonal functions. While low individual exposure might pose little risk, combined exposure can be concerning.
Phthalates and parabens, found in plastics and cosmetics, are examples. People are exposed to these chemicals through daily product use. However, choosing products labeled free of these compounds can reduce their presence in the body.
New Testing Methods for Chemical Mixtures
Many chemicals enter the environment from diverse activities. People experience varying combinations based on lifestyle choices and locations. Testing every chemical combination is not feasible; however, researchers study mixtures that mirror real-world exposure and group chemicals based on biological effects.
Rapid lab testing, computer models, and artificial intelligence predict interactions and identify which mixtures require further study. Exposomics aims to relate a lifetime of exposure to health outcomes, advancing mixture science rapidly but leaving some questions open.
Image: A community addresses harmful chemicals in drinking water. Watch the PBS News Hour segment above.
Practical Steps to Reduce Exposure
Avoiding all chemicals is impractical. Instead, focus on minimizing unnecessary exposures. Improve indoor air quality by venting spaces during cooking and cleaning. Open windows and use exhaust fans when air quality permits. Studies suggest these actions reduce indoor pollution.
Question frequent use of scented products. Consider fragrance-free versions, use fewer overlapping products, or limit strong scents to occasional use to reduce exposure to fragrance-related chemicals.
For food, adopt healthy habits. Wash produce under running water and maintain a varied diet. This practice reduces the chance of repeated exposure to similar pesticide residues.
If relying on public water, review local water quality reports. For filtration, select certified systems that address specific contaminants of concern. Regularly replace filters as instructed by manufacturers.
These straightforward steps assist in limiting exposure while research continues on the health impacts of daily chemical mixtures.
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