Gizmorama - August 16, 2017
Want to help the environment? Crank the air conditioning in your car. No, really!
Learn about this and more interesting stories from the scientific community in today's issue.
Until Next Time,
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*-- To reduce exposure to pollution on your commute, crank the air conditioning --*
New research suggests the best way to minimize your pollution exposure on the commute to and from work is to crank the air conditioning in your vehicle.
Most Americans spend almost an hour traveling to and from work each day. And it is during the commute that people experience the majority of their daily exposure to contaminants.
To determine how drivers and passengers might mitigate their exposure risks, scientists at Washington University in St. Louis tested what effects the car ventilation system has on passing pollutants.
Scientists tested different combinations and fan and air conditioning settings and monitored contaminant concentrations using portable sensors. A dashboard camera allowed scientists to determine how outside variables -- a restaurant exhaust system or a passing diesel truck -- impacted exposure.
"As aerosol scientists, we had access to state-of-the-art air monitoring equipment," Nathan Reed, a doctoral candidate at WUSTL, said in a news release. "Once we began measuring inside and outside of the car, and started getting numbers back, we were able to confirm our hypothesis that by controlling our car's ventilation we could mitigate some pollutant risk."
Researchers found that using air conditioning reduced the amounts of the pollutants inside the vehicle by 20 to 34 percent. While the fan and AC both pull air from the outside, the air conditioning system sees air passed across a cold evaporator.
"This cold surface attracts the pollutant particles, and they deposit there, as opposed to diffusing it into the air you're breathing," Reed said.
Scientists found the AC was best at minimizing pollution exposure when following a heavy polluter like a bus or big rig.
Of course, using the AC also diminishes a car's fuel economy, contributing to auto emissions. Scientists recommend deploying the AC only when presented with a high pollution exposure scenario. Once the truck or bus is gone, the driver should role down the windows to allow any buildup of pollutants to dissipate.
Scientists detailed their experiments in a paper published this week in the journal Atmospheric Environment.
* Heat map showcases extreme temperatures in Southern Europe *
A new heat map published by the European Space Agency offers a colorful, bird's-eye-view of last week's heatwave in Southern Europe.
As showcased by the swath of organs and red hues blanketing much of the Mediterranean, much of Southern Europe experienced highs near 105 degrees Fahrenheit.
During the string of extreme highs, ESA's Earth-observing and weather satellites helped track developments from Earth's upper atmosphere. Satellites like Copernicus Sentinel-3A tracked wildfires and measure surface temperatures, enabling the creation of the newly published heat map.
"The map uses data from the satellite's Sea and Land Surface Temperature Radiometer, which measures energy radiating from Earth's surface in nine spectral bands -- the map therefore represents temperature of the land surface, not air temperature which is normally used in forecasts," ESA officials wrote in a blog update.
Over the weekend, a cool front moved across the region providing relief to southern and eastern Europe, but forecasts suggest more hot weather is on the way.
Meteorologists say the heatwave was the region's hottest and most sustained since 2003. A spate of water shortages and wildfires have been blamed on the heatwave. At least five people died as a result of the extreme heat.
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