"Rolling coal" as it's called is in response to environmentalists looking to lower carbon emissions in cars.
Truckers essentially trick their vehicles into thinking they need to use more gas than it actually needs. The more fuel that's used up, the more exhaust comes out thus the big plumes of dark emissions from a "rolling coal truck."
According to Daily Digest News, turning a truck into a rolling coal truck can cost as much as $5,000.
When asked about the changes "rolling coal" truck owners made Liz Purchia, a spokeswoman for the Environmental Protection Agency, said that "the short answer is this is illegal." Purchia pointed TPM to two specific paragraphs on the EPA's air enforcement page. One paragraph said "It is a violation of the [Clean Air Act] to manufacture, sell, or install a part for a motor vehicle that bypasses, defeats, or renders inoperative any emission control device."
Purchia also noted that the "CAA prohibits anyone from tampering with an emission control device on a motor vehicle by removing it or making it inoperable prior to or after the sale or delivery to the buyer."
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(Photo credit: Youtube)
This post was updated.