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The California dream is becoming a bit more of a nightmare, at least according to some truckers there. With the California Air Resources Board (CARB) mandating that older trucks be equipped with a special diesel soot filter in order to reduce pollution, trucking advocates are arguing that the device is not only cost-prohibitive but dangerous as well, says Forbes.

The issue involves larger trucks made between 2000 and 2004 being required to be fitted with a device that can cost as much as $15,000 a pop, or as much as $1 billion a year to the industry, Forbes says, citing the California Trucking Association (CTA). Truckers say some of the devices have caused engine shutdowns and even fires. CARB representatives say that those problems have arisen from misuse by truckers. If the semis spew out soot without a filter, truckers can be fined as much as $10,000 a day for non-compliance.

California has long taken the lead in vehicle anti-pollution efforts. The state began requiring catalytic converters on light-duty vehicles as far back as the mid-1970s, and more recently set a goal to have at least 15 percent of vehicles sold in the state in 2025 be powered either by batteries, a plug-in hybrid powertrain or a hydrogen fuel cell.