If you saw a school bus engulfed in flames on the side of the road, you probably wouldn’t think the fire was caused by an air pollution regulation.
But in all likelihood, it was.
In 2008, the California Air Resources Board adopted the Statewide Truck and Bus Rule, which said diesel engines manufactured before 2010 could not be operated on state roads unless they were outfitted with a filter — at a cost of up to $15,000 per vehicle — to reduce the amount of fine particles released into the air.
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