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ARB announces fines for violations of diesel truck and bus fleet rules

Diesel smoke spews from a truck as morning commuters travel the 210 freeway between Los Angeles and cities to the east on December 1, 2009 near Pasadena, California.
Diesel smoke spews from a truck as morning commuters travel the 210 freeway between Los Angeles and cities to the east on December 1, 2009 near Pasadena, California.
Photo by David McNew/Getty Images
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