Your phone says a lot about you, and if you are one of the testers of UCLA’s Personal Environmental Impact Report, your phone is telling your friends how green you are. Or aren’t.

Comparing uploads from users’ Nokia GPS-enabled phones with info from public databases, Personal Environmental Impact Report (PEIR) calculates whether you are driving or walking to work, whether you stopped for fast food, how much you polluted near a hospital and how much smog you inhaled.

Then it lets you publish your report card on Facebook.

That doesn’t make it a competition, according to Jeff Burke, the area lead for the Urban Sensing program at UCLA.

"Life is complex – lots of things go into people’s transportation choices" Burke said. "Our initial aim was conversation, not competition."

The app is being demoed at the Wired NextFest future tech expo in Chicago’s Millennium Park. The free exhibit runs through October 12.

Burke admits to driving a non-hybrid that gets low gas mileage, but says working on PEIR has an effect – even when he’s too busy to upload his GPS data.

"Even just developing this has made us more cognizant of things we do daily," Burke said.

PEIR users upload their GPS coordinates, which are taken at 30 second intervals. Then PEIR tries to understand what mode of transportation a person traveled by using algorithms similar to those used in speech recognition,

It’s not as simple a problem as one might think, since walking in L.A., though rare, can look much like traveling by car in the traffic-choked city when viewed by GPS coordinates only.

Since raw scores don’t mean much, PEIR shows people their trends over time in each of the four categories: smog exposure, fast food exposure, carbon impact and sensitive sites impact.

PEIR developers plan to add a way to plot alternative routes and compare their scores before leaving the house and deciding whether to bring the car keys or the bus pass.

Currently the app is in a closed 30-person beta in Los Angeles, and the group is looking to expand to testing with a group of high school students in the Bay Area –- though the eventual goal is global. As in global warming.

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