Popular Science magazine has ranked Portland #1 and Eugene #5 on its newly published list of the Greenest Cities in America.

The rankings, which are based on the following criteria:

We used raw data from the U.S. Census Bureau and the National Geographic Society’s Green Guide, which collected survey data and government statistics for American cities of over 100,000 people in more than 30 categories, including air quality, electricity use and transportation habits. We then compiled these statistics into four broad categories, each scored out of either 5 or 10 possible points. The sum of these four scores determines a city’s place in the rankings. Our categories are:

* Electricity (E; 10 points): Cities score points for drawing their energy from renewable sources such as wind, solar, biomass and hydroelectric power, as well as for offering incentives for residents to invest in their own power sources, like roof-mounted solar panels.
* Transportation (T; 10 points): High scores go to cities whose commuters take public transportation or carpool. Air quality also plays a role.
* Green living (G; 5 points): Cities earn points for the number of buildings certified by the U.S. Green Building Council, as well as for devoting area to green space, such as public parks and nature preserves.
* Recycling and green perspective (R; 5 points): This measures how comprehensive a city’s recycling program is (if the city collects old electronics, for example) and how important its citizens consider environmental issues.

According to the magazine, 1 in 4 Portlanders commute to work via public transportation, bike, or carpool, and the city draws half of its power from renewable resources.