8: San Diego–Chula Vista-Carlsbad. 9: Houston-The Woodlands. 10: Salt Lake City-Provo-Orem. 11: San Jose-San Francisco-Oakland.
A look at the California Air Resources Board's regulation of heavy trucks – Press Telegram
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8: San Diego–Chula Vista-Carlsbad. 9: Houston-The Woodlands. 10: Salt Lake City-Provo-Orem. 11: San Jose-San Francisco-Oakland.
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