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Household Products Cause as Much Air Pollution as Cars, Surprising Study Finds

Health + Wellness
Household Products Cause as Much Air Pollution as Cars, Surprising Study Finds
themorningglory / Flickr

Petroleum-based chemicals, such as those used in paints, cleaners and personal care products such as perfumes and deodorants, contribute as much to volatile organic air pollution in urban areas as cars and trucks, according to a new finding published in Science.

The consumer products emit synthetic "volatile organic compounds" or VOCs that contribute to ground-level ozone or small particulate pollution, causing asthma, lung disease and other serious health problems.


According to the research led by Colorado University, the source of non-vehicle VOC sources is likely two or three times higher than estimated under present air pollution inventories. Meanwhile, stricter vehicle emission controls have made cars and trucks cleaner—resulting in consumer products rivaling cars in air pollution contribution.

As reported by the Washington Post:

"These results have important implications for how and what emissions we regulate," said Brent Stephens, an expert on indoor air and the built environment at the Illinois Institute of Technology [by email]. "We have traditionally focused on transportation and industrial emissions to the outdoor environment. [Volatile chemical products] are now relatively more important emission sources, and they come from both indoor and outdoor sources (and some primarily from indoor sources), although we don't regulate the vast majority of indoor environments."

Stephens noted that proposed budget cuts to the Environmental Protection Agency loom large in this context, because the agency conducts much relevant work on atmospheric chemistry and air quality.

"We typically think of outdoor air pollution as an outdoor problem," Stephens added. "But this study demonstrates (quantitatively) that it's more complicated than that."

For a deeper dive:

Washington Post, New York Times, Axios, Financial Times, BBC, The Guardian, KPCC, SF Gate, LA Times

For more climate change and clean energy news, you can follow Climate Nexus on Twitter and Facebook, and sign up for daily Hot News.

A net-casting ogre-faced spider. CBG Photography Group, Centre for Biodiversity Genomics / CC BY-SA 3.0

Just in time for Halloween, scientists at Cornell University have published some frightening research, especially if you're an insect!

The ghoulishly named ogre-faced spider can "hear" with its legs and use that ability to catch insects flying behind it, the study published in Current Biology Thursday concluded.

"Spiders are sensitive to airborne sound," Cornell professor emeritus Dr. Charles Walcott, who was not involved with the study, told the Cornell Chronicle. "That's the big message really."

The net-casting, ogre-faced spider (Deinopis spinosa) has a unique hunting strategy, as study coauthor Cornell University postdoctoral researcher Jay Stafstrom explained in a video.

They hunt only at night using a special kind of web: an A-shaped frame made from non-sticky silk that supports a fuzzy rectangle that they hold with their front forelegs and use to trap prey.

They do this in two ways. In a maneuver called a "forward strike," they pounce down on prey moving beneath them on the ground. This is enabled by their large eyes — the biggest of any spider. These eyes give them 2,000 times the night vision that we have, Science explained.

But the spiders can also perform a move called the "backward strike," Stafstrom explained, in which they reach their legs behind them and catch insects flying through the air.

"So here comes a flying bug and somehow the spider gets information on the sound direction and its distance. The spiders time the 200-millisecond leap if the fly is within its capture zone – much like an over-the-shoulder catch. The spider gets its prey. They're accurate," coauthor Ronald Hoy, the D & D Joslovitz Merksamer Professor in the Department of Neurobiology and Behavior in the College of Arts and Sciences, told the Cornell Chronicle.

What the researchers wanted to understand was how the spiders could tell what was moving behind them when they have no ears.

It isn't a question of peripheral vision. In a 2016 study, the same team blindfolded the spiders and sent them out to hunt, Science explained. This prevented the spiders from making their forward strikes, but they were still able to catch prey using the backwards strike. The researchers thought the spiders were "hearing" their prey with the sensors on the tips of their legs. All spiders have these sensors, but scientists had previously thought they were only able to detect vibrations through surfaces, not sounds in the air.

To test how well the ogre-faced spiders could actually hear, the researchers conducted a two-part experiment.

First, they inserted electrodes into removed spider legs and into the brains of intact spiders. They put the spiders and the legs into a vibration-proof booth and played sounds from two meters (approximately 6.5 feet) away. The spiders and the legs responded to sounds from 100 hertz to 10,000 hertz.

Next, they played the five sounds that had triggered the biggest response to 25 spiders in the wild and 51 spiders in the lab. More than half the spiders did the "backward strike" move when they heard sounds that have a lower frequency similar to insect wing beats. When the higher frequency sounds were played, the spiders did not move. This suggests the higher frequencies may mimic the sounds of predators like birds.

University of Cincinnati spider behavioral ecologist George Uetz told Science that the results were a "surprise" that indicated science has much to learn about spiders as a whole. Because all spiders have these receptors on their legs, it is possible that all spiders can hear. This theory was first put forward by Walcott 60 years ago, but was dismissed at the time, according to the Cornell Chronicle. But studies of other spiders have turned up further evidence since. A 2016 study found that a kind of jumping spider can pick up sonic vibrations in the air.

"We don't know diddly about spiders," Uetz told Science. "They are much more complex than people ever thought they were."

Learning more provides scientists with an opportunity to study their sensory abilities in order to improve technology like bio-sensors, directional microphones and visual processing algorithms, Stafstrom told CNN.

Hoy agreed.

"The point is any understudied, underappreciated group has fascinating lives, even a yucky spider, and we can learn something from it," he told CNN.

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