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... The study found that residents living near railroad tracks likely have higher premature mortality rates due to air pollutants released during the passage of uncovered coal trains. The analysis of the San Francisco Bay Area cities of Oakland, Richmond, and Berkeley shows that increases in air pollutants such as small particulate matter (PM 2.5) are also associated with increases in asthma-related episodes and hospital admissions.

"This has never been studied in the world. There's been a couple studies trying to measure just the air pollution, usually in rural areas, but this was the first to both measure air pollution and trains in an urban setting," said Bart Ostro, author of the study and an epidemiologist at the University of California, Davis.
Persistent coal pollution

Trains carry nearly 70 percent of coal shipments in the United States, leaving a trail of pollution in their wake. And coal exports will have a similar impact during transit. Ostro explained that when uncovered coal trains travel, the coal particles disperse around the railroad tracks. Levels of PM 2.5 "[spread] almost a mile away," he added.

As a result, the mere passage of coal trains could affect the health of surrounding communities. Ostro was particularly concerned about how these pollutants could harm vulnerable populations living near the coal export terminal in Richmond. Previous census data had already shown that those in Richmond who live around the rail line have mortality rates 10 to 50 percent higher than the county average. Communities in Oakland could be at risk, too, since discussions are underway to build a new coal export terminal in the region. ...