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Prior to passage by the California Legislature of AB 32, California’s Global Warming Solutions Act, and the basis for all of the CARB regulations, Enstrom was on record with a peer-reviewed study in 2005, which showed that fine particulate matter does not kill California residents‚Äîthe basis of California’s restrictions on diesel engines because of their contributions to particulate air pollution health effects.
Enstrom’s studies are all peer-reviewed, unlike the CARB Diesel Particulate study by Hien Tran. Enstrom blew the whistle on Tran, but the majority of mainstream media in California tried to ignore the scandal, or participated in the cover up.
After Tran was exposed with a mail order Ph.D. from diploma mill Thornhill University with a mailing address at a New York UPS store, CARB Director Mary Nichols ordered a follow-up study but used non-peer-reviewed research, called “questionable” by a federal review panel.
In addition, Dr. Enstrom also proved that University of California science professors exaggerated the health effects of diesel particulate in California, knowing the results would be used by the CARB to regulate diesel-engine vehicles.
In a dramatic reversal of its previous position, CARB explains that the potential for serious engine malfunction and damage arises as the DPF device ages on the engine. When the DPF becomes clogged with soot, it must go through repeating cycles of regeneration to burn off the soot. Over time, operating exactly as intended, the buildup of soot in the DPF and extremely high heat damages the filter and other components of the engine, and this, in turn, creates excessive heat buildup and backpressure in the engine, which eventually and inevitably causes engine damage. All of this is set forth in CARB’s Notice of Public Hearing for April 22, 2016, and supporting documentation, proposing to make aftermarket parts available for the repair of the 2007-2009 DPFs, including retrofitted and original equipment manufactured (OEM) DPFs.
In CARB’s own words:
“[T]he trapped soot in the wall-flow DPF builds up over time, increasing the backpressure in the engine as it continues to operate. Operating the engine at excessive backpressure for extended periods will impact engine performance and eventually cause engine damage.”
CARB further states:
“As these engines age, there is an increasing need to replace the OEM DPFs as the parts experience wear. Engine problems such as faulty turbochargers, bad fuel injectors, or malfunctioning EGR [Exhaust Gas Recirculation] valves can negatively impact DPFs in several ways including catalytic poisoning, fouling or overloading the DPF, or causing thermal damage due to more frequent regeneration.”