We’ve all seen it while following big rigs: Clouds of sooty smoke coming from a single truck, prompted by an uphill grade, a passing maneuver, or sometimes seemingly nothing at all. How can that be legal? It might not be legal, but it underscores a current loophole in U.S. emissions for larger (Class 4-8) trucks: There’s no mechanism... California could soon close one of the dirtiest diesel-emissions loopholes
We’ve all seen it while following big rigs: Clouds of sooty smoke coming from a single truck, prompted by an uphill grade, a passing maneuver, or sometimes seemingly nothing at all. How can that be legal? It might not be legal, but it underscores a current loophole in U.S. emissions for larger (Class 4-8) trucks: There’s no mechanism...