Friday June 03, 2005

Riding in the Back of the Bus

Researchers from the University of California, Los Angeles, "drove six [school] buses of various ages on a total of 16 runs along actual routes in and around Los Angeles. On about half the runs, the bus windows were open." During the runs, scientists used a nonreactive tracer gas, fed through the exhaust systems, to measure the amount of exhaust particles that would reach passengers and be inhaled.

On average, they learned that the rear of each bus' interior is one-third more polluted than the front. Older buses and buses driven with the windows closed showed more onboard air pollution than other buses.

For example, with the windows open, a 30-year-old bus in the study generated twice as much onboard pollution as a 10-year-old bus did. Closing the windows slightly increased passengers' pollution exposure on a 3-year-old bus but tripled it on the 30-year-old one.

[Science News, May 21, 2005, vol 167, no. 21]

Ugh. (And recall the study was done in LA, where opening the windows is not necessarily a wise thing to do!

Riding in the Back of the Bus ( in category News & Information ) - posted at Fri, 03 Jun, 07:37 Pacific | Comments (0)