No Escape From Diesel Exhaust

Every day, Americans are needlessly sickened from exposure to air pollution in the form of fine particles. Overall, health researchers estimate that fine particles, such as those found in diesel exhaust, shorten the lives of 70,000 Americans each year. Legions of published, peer-reviewed studies have documented the increased exposure and resultant health risk from particles in and around nearby roadways. When during our day are we exposed to these particles? According to the California Air Resources Board, although we spend only about six percent of our day commuting to and from work, it is during that time when we receive over half of our exposure. Using comparable instruments and research techniques as those employed by health researchers at major universities, Clean Air Task Force (CATF) investigated the exposure to diesel particles during typical commutes in four cities: Austin, Texas, Boston, Massachusetts, New York City, and Columbus, Ohio. In addition, CATF tested the air quality benefits due to emission control retrofits of transit buses in Boston and transit buses and garbage trucks in New York City. CATF's investigation demonstrated that whether you commute by car, bus, ferry, train, or on foot, you may be exposed to high levels of diesel particles

SUSAN JAMES, a 50-year-old probation officer in Bakersfield, Calif., has been a competitive runner for almost three decades. "I've spent a lot of hours running through this city," she said.

Which is beginning to worry her.

"Twenty years ago, I didn't have asthma or allergies," she said. Today, she has both, probably due to the same improbable cause. "My doctor told me I'm allergic to Bakersfield air," she said. "I'm actually allergic to it."

In May, the American Lung Association called Bakersfield the third-sootiest city in the country, behind Los Angeles and Pittsburgh.

The news didn't surprise Ms. James. "Sometimes my chest aches" midrun, she said. To combat the pollution, she may soon join a gym for the first time. "I've got a lot of years to run still, and I'm not sure if I can do it outside," she said.

Air pollution is on the minds of many athletes this summer, especially those who, in a reverse of Ms. James's plan, have moved their workouts outside.

Fitness chat rooms resound with worried postings about air quality. As one cyclist wrote on SoCalCycling .com, "During the summer months, I have to ride in the morning and be home no later than 11, otherwise I will feel miserable and cough all day long."

A new study suggests that children who grow up within a third of a mile of a freeway may be sustaining permanent respiratory problems.

Researchers studied developing lung function in 1,445 children living in 12 Southern California communities for eight years, from age 10 to 18. They found that the closer the children lived to a freeway, the more likely they were to experience reduced growth in lung function as measured by the standard tests.

"That living near freeways is a health issue is something we've known about for a long time," said Gennet Paauwe, a spokeswoman for the California Air Resources Board, which financed part of the research. "All of this points to the fact that California's air pollution control program needs to continue with its aggressive reduction in air pollutants. But I think this would translate to any other part of the U.S. where people are living near heavily trafficked roadways."

The findings were published online Friday by the British journal Lancet.