Study links heavy diesel exhaust to lung cancer

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WASHINGTON (AP) -- There's new evidence that exposure to exhaust from diesel engines increases the risk of lung cancer.

Diesel exhaust has long been classified as a probable carcinogen. But the 20-year study from the National Cancer Institute took a closer look by tracking more than 12,000 workers in certain kinds of mines who breathed higher levels of exhaust from diesel-powered equipment than the general population.

The study concludes the most heavily exposed miners had three times the risk of death from lung cancer compared to workers with the lowest exposures. But even workers with less exposure had some extra risk.