One of the arguments frequently made for building more mass transit — in particular rail projects — is that it will help reduce pollution and, as a byproduct, greenhouse gases that are contributing to climate change. The above chart comes from a Federal Transit Administration report updated in 2010 that considers the impacts of cars versus transit. Although in some circles this remains a disputed issue (mostly by critics of rail transit), the FTA finds transit is the clear winner.
Comparing the emissions of cars versus transit is not always a clear-cut issue because of the number of variables involved. Which brings us to a new study by several UCLA researchers that drills down deeper on the subject by comparing the Orange Line, Gold Line and average automobile in Southern California. The study was published in Environmental Research Letters and is posted below.
The study found that in both the near term and long-term, the Orange Line and the Gold Line produced less smog and greenhouse gases than the average auto driven in L.A. County. In addition, the Orange Line and Gold Line used less overall energy than cars and will create less particulate matter than cars in the long-term, although the Gold Line currently produces about the same as cars, due mostly to its electricity coming from coal-fired power plants used by the Los Angeles Department of Water and Power.
To read the full article by Steve Hymon click here.