|Photo by Graur Codrin|
According to the L.A. Times' technology blog:
The USC team has devised an algorithm that uses the phone's location and the direction it was pointing to determine how bright the sun should be in your image. It then looks at your photo to see how much that theoretical sunlight has been obscured, and from that calculates how much gunk is in the air (it doesn't work yet on highly cloudy days).For those Apple users (like me!) who feel left out of the loop - the researchers say an iPhone app is in the works.
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