31 Dec 2012:
Network of Smartphone-Based
Sensors Track Air Pollution Levels
Researchers at the University of California, San Diego have developed a network of smartphone-based air pollution monitors
that allow individuals to track pollution levels in real time and feed a central
database of air quality trends citywide throughout the day. The so-called CitySense devices are equipped with sensors that measure ozone, nitrogen dioxide, and carbon monoxide, and a digital app that illustrates the color-coded results based on the U.S. Environmental Protection Agency’s air quality ratings. During a four-week test, in which the phones were distributed to 30 volunteers, the system showed hotspots of elevated pollution that shifted over the course of the day. Ultimately, the developers hope to deploy hundreds of devices in order to generate a public database on air quality levels. “We want more data and better data, which we can provide to the public,” said William Griswold, a computer science professor at UC San Diego. “We are making the invisible visible.”
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Yale Environment 360
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Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.
is now available for mobile devices at e360.yale.edu/mobile
An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
Ugandan scientists monitor the impact of climate change on one of Africa’s most diverse forests and its extraordinary wildlife. Learn more.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
video goes onto the front lines with Colorado firefighters confronting deadly blazes fueled by a hotter, drier climate. Watch the video.
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.