Your Shampoo, Hair Spray And Skin Lotion May Be Polluting The Air


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Millions of Americans apply personal care products every morning before heading to work or school. But these products don’t stick to our bodies permanently. Over the course of the day, compounds in deodorants, lotions, hair gels and perfumes evaporate from our skin and eventually make their way outdoors. Now there’s new evidence to suggest that these products are major sources of air pollution in urban areas.

For decades, motor vehicles were considered the primary source of air pollutants in major U.S. cities. Vehicle exhaust contains multiple pollutants that worsen air quality, including nitrogen oxides, particulate matter and volatile organic compounds (VOCs) – a group of reactive gases that contribute to smog formation.

Thanks to advances in catalytic converters and improvements in fuel economy, combined emissions of common pollutants from cars have decreased by 65 percent since the 1970s. Air pollution is still a problem in urban areas like Los Angeles, but only a fraction of it can be attributed to vehicles. Today, scientists are finding that other non-combustion sources – including common household products – are also major contributors.

  Volatile organic compounds (VOCs) react in the air with nitrogen oxides to form ozone and smog. Minnesota Pollution Control Agency

A Unique Fingerprint

In a recent study with U.S. and Canadian colleagues, our lab found that these sources can include personal care products. We analyzed urban air in two cities: Boulder, Colorado, and Toronto, Ontario, Canada.

In Boulder, our lab had recently invested in new instrumentation, which we wanted to use to measure wood stove emissions during winter months. For five weeks we sampled air from the roof of the NOAA David Skaggs Research Center in hope of measuring air parcels contaminated with smoke from residential wood stoves. Surprisingly, we noticed a signal that stood out unexpectedly from all the other data. This compound, which we identified as decamethylcyclopentasiloxane (or D5 siloxane), contains silicon, which uniquely differs from the organic compounds we normally detect.

By reviewing scientific literature, we learned that pure D5 siloxane is produced mainly as an additive for deodorants and hair care products. On average, people use products that contain a total of about 100-200 milligrams of D5 every day – roughly the weight of half an aspirin tablet. Some fraction of these products end up going down the drain when we shower, but the majority of what remains on our bodies ends up in the atmosphere. D5 can also be found in many other places, including soil, oceans and the tissues of fish and human beings

Many labs have studied the environmental fate of D5, but from our perspective it is particularly useful because it acts like a fingerprint. If we detect D5 in the atmosphere, we know that the air mass we measured was influenced by emissions from personal care products. By comparing the amount of D5 in the atmosphere to other fingerprint markers, such as compounds present in vehicle exhaust, we can estimate how important personal care products are as an emissions source relative to better-understood sources.

 Air pollution from transportation in the U.S. has fallen in the past 40 years even as population and vehicles miles traveled have increased. USEPA

Emissions Spike During Morning Rush Hour

In Boulder and Toronto, we found that D5 was present in urban air at mass concentrations comparable to those of benzene, a chemical that is a marker for vehicle exhaust. (Benzene is a known carcinogen and is also found in industrial emissions and cigarette smoke.)

D5 concentrations were highest in the morning – the time when most people shower, apply personal care products and then leave the house to commute to work. We also observed a peak in benzene emissions in the morning, when people drive to work. During morning rush hour, we found that emissions of D5 and benzene were almost equivalent.

In other words, at this time of day, people emitted a plume of organic compounds that was comparable in mass to the plume of organic compounds emitted from their vehicles. Researchers still have a lot to learn about how these chemicals react in the atmosphere to form smog, so the air quality implications of these morning emissions remain unclear.

Benzene emissions remained high throughout the day as people drove around the city, but D5 emissions eventually tapered off as personal care products evaporated from users’ skin. We estimate that, on average, the entire population of the city of Boulder emits 3 to 5 kilograms (6 to 11 pounds) of D5 per day, and that their cars emit about 15 kilograms of benzene in vehicle exhaust.

VOC Emissions From Your Medicine Cabinet

While these numbers may seem surprisingly high, our findings support recent modeling work conducted by Brian McDonald, a co-author of this study, which showed that personal care product VOC emissions in Los Angeles now rival VOC emissions from gasoline and diesel exhaust. Taken together, these two studies demonstrate that our urban air is remarkably different from what it was decades ago. Cars today emit fewer smog-inducing organic compounds, while other sources are now becoming important contributors to air pollution.

D5 is only one component of personal care product emissions, and many other compounds could be emitted with it. To fully assess how seriously these emissions may affect the environment and human health, researchers have to answer many more questions. What other compounds enter the atmosphere after we apply personal care products? Once in the atmosphere, what happens to them? Are they capable of contributing to smog formation? Our lab and others around the country are considering these questions now in hopes of improving our understanding of urban air pollution.

Matt Coggon is a scientist with the Cooperative Institute for Research in Environmental Sciences. His research focuses on understanding the composition and chemical evolution of volatile organic compounds in the atmosphere. His current interests are focused on quantifying the emissions from everyday consumer goods, such as personal care products, paints, and solvents. He is also working to understand the chemical evolution of biomass burning emissions in the atmosphere.

This article was republished from The Conversation.

See also:
Make Sure The Products You’re Putting On Your Body Are Not Toxic
12 Plants That Naturally Remove Toxins and Purify Your Air

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November 13, 2019

During the wee morning hours the Moon enters Gemini. Curiosity is piqued and tongues are ready to wag. The focus on ideas and information is intense today. Retrograde Mercury slips into a sextile with serious Saturn and a trine to dreamy Neptune…
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