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Capitol Weekly

California takes new look at diesel rules

By John Howard | 09/09/10 12:00 AM PST

California’s air-quality enforcers dramatically overstated the impact of soot from diesel construction equipment, at least in part because the state’s abrupt economic decline idled thousands of vehicles.

Controlling the emissions from off-road diesel equipment – including the vehicles used in heavy construction – has been the subject of debate for years at the Air Resources Board. The construction industry, citing a number of studies, has long complained that ARB’s data was skewed.

The issue is more than a scientific discussion. The potential regulations could cost billions of dollars to put into effect, according to estimates from the government as well as private industry. By the ARB’s own estimate, based on federal data, diesel pollution results in some 9,000 premature deaths annually, most from respiratory-related illnesses. The ARB’s earlier projections served as the basis of regulations to phase in soot-blocking equipment on diesel fleets beginning this year. The ARB has halted the rules while it reviews its research and findings, which had been sharply challenged by the construction industry and some scientific researchers.

The ARB acknowledged last week during a series of workshops on the issue that its original estimates needed to be reviewed – a review that is currently under way.

The revised rules are expected to be placed before the board in December. The registration piece of the regulations, in which vehicle owners identify their equipment to enable regulators to craft an emissions inventory, already has been completed.

“One of the things we’ve been doing is going back and looking at the emissions,” said Todd Sax, chief of the ARB’s mobile source analysis branch. “Part of that is that the recession has had a really serious impact. Since the peak in 2005-06, construction activity has basically dropped by half.”

Although far overshadowed by the state’s greenhouse gas emissions law, AB 32, the regulations to curb off-road diesel pollutants have a far greater, immediate impact on health and the economy. They are among the most significant regulations ever adopted by the ARB, which has a national reputation for air-quality enforcement.

The ARB currently is considering pushing back the start-up date for the large-fleet regulation – it was supposed to ramp up six months ago - until 2012, but opponents of the rule said it should be scrapped entirely.

“As the agency’s own data now makes clear, it is time for the board to repeal its costly and unneeded rule,” said Michael Kennedy, the general counsel of the Associated General Contractors, which has long fought the regulation. Kennedy said the ARB’s researchers overestimated the impact of the diesel soot by more than three-fold, according to an analysis conducted by Sierra Research and commissioned by the contractors.

The ARB’s original projections anticipated nearly 200,000 diesel-driven heavy construction vehicles. Amid the economic slump, however, those numbers were revised downward to less than 150,000. Fewer vehicles mean less pollutants in the air.

“We’re revising our fuel-consumption numbers downward from a billion gallons a year to about 220 million gallons,” said Mike Lewis, head of the Coalition to Build a Cleaner California. “Also, the fleet is newer and the fleet is not working at full load. The combination of all these factors is that there was a drop in emissions from off-road construction equipment.”

“With just a few changes, [CARB] had an opportunity to make this a win-win for California’s environment and economy,” said Lewis, who also is president of the Construction Industry Air Quality Coalition. “Instead they adopted a rule that is not viable in the real world.”

Lewis added that the legislation will cause significant job loss and threaten the survival of many businesses.

Regardless of the fate of the disputed regulations, however, the impact on health of diesel pollutants is clear, the ARB noted.

This week, the board reported that about 9,000 people die prematurely in California due to exposure to what is known as fine-particle pollution, which includes certain kinds of soot from diesel engines.

The ARB report was based on recent scientific findings of the U.S. Environmental Protection Agency, which regularly reviews the nation’s air quality. The findings show a connection between exposure to fine particle pollution and premature death, the ARB said.

“This study is further evidence that we are on the right track, and ARB will continue to work with truckers and equipment owners to clean up diesel emissions, improve our air quality and protect public health. ARB is committed to reducing this staggering statistic because one premature death is one too many,” ARB Chair Mary Nichols said in a written statement.

Fleet operators, construction-equipment owners, contractors and others have complained about ARB-written regulations requiring the phase-in of new equipment over time to block diesel soot. Environmentalists, citing research by the ARB and other air-quality experts, believe diesel soot represents a long-term, well-documented health hazard.

Earlier, the ARB estimated the economic impact of a diesel regulation at $4.4 billion to $5.4 billion, an amount that reflects the costs of equipping trucks with anti-pollution devices that can cost $20,000 each, or more. The regulation will be phased in over a decade.

“As a result of this review, the U.S. EPA concluded that there is a causal relationship between exposure to fine particle pollution and premature death.  A causal relationship indicates the highest level of scientific certainty,” the ARB said.

ARB’s report estimated that 9,200 premature deaths in California are associated with fine particulate pollution on an annual basis, with a statistical range from 7,300 to as high as 11,000 premature deaths each year.  California has the most extensive particulate monitoring network in the nation.  


Global warming and diesel emission regulations share one thing in common. Junk but "popular" science. There are a percentage in the environmental movement and a section of folk in CARB that believe the only good diesel is a dead diesel. Of course, the diesel is the current engine of capitalism (yes, I said the bad word) and making it more and more difficult to survive in this state as business people are of little concern to this group.
"One premature death is one too many" is true. Ban smoking, drinking, pot, driving, biking, hiking, working. These all cause premature deaths.

New diesels are 100% cleaner then their older units and normal business practices have contractors replacing old with newer. The air will clear without any more government interference.

But then again, without global warming and diesel, how would those 1,178 CARB employees making an average of $87,000 a year do to justify their jobs?

This is man-made unlike global warming.


CARB overestimated emissions from off-road construction equipment by nearly 400 percent and they are overstating the health impacts in California by equally large numbers. The national numbers cited in the EPA reports do not reflect regional differences in the substances that make up PM 2.5 (which is a measure of mass, not chemistry). In California there is no measurable health effect from this material, based on either the EPA studies or the discreted Tran Report that the ARB used to establish the diesel rules in the first place. In fact, most of the studies cited in the EPA report are the same ones used in the Tran Report.

--William E. Davis

In fact, the effect of air pollution, as measured by PM2.5, differs significantly in the western US from the East, being non-fatal in the west and associated with a small increase in mortality in the East.  PM2.5 is not chemically defined and is significantly different in composition, east versus west. Multiple studies show no association of PM2.5 levels with increased mortality in California using California only data. The story here is ARB’s insistence on using data from the East to justify its regulations in California.

Professor James Enstrom has pointed out this misuse of data and statistics. ARB is purposely using scare tactics based on selective use of data and publications to push its agenda forward. No one is dying in California due to air pollution and the ARB knows it. Their own consultants, Professors Jerrett at Berkeley and Krewski at the University of Ottawa, confirm that there is no effect of PM2.5 on mortality in California based on California data. No one is dying in California due to air pollution. Not 11,000. Not 9,200. Not 7,300. The answer is Zero and ARB knows it.