An estimated 70% of California's construction equipment is currently not covered by federal and state regulations because it is too old, state officials said.
Although federal rules adopted in 2004 require cleaner-emitting new equipment, the regulations don't cover existing engines. Anair said an average excavator or tractor can last 20 or 30 years, meaning it could be decades before all the dirty equipment is replaced.
Calling the timing coincidental, the California Air Resources Board on Monday released a draft of new regulations for older engines. The proposal would require all construction, mining and other industrial off-road equipment to be replaced or retrofitted between 2009 and 2020 as part of an effort to reduce diesel particulate emissions by 85% and nitrogen oxide, a key ingredient in smog, by 70%, said Erik White, chief of the board's heavy-duty diesel branch. Public workshops on the plan will be held this month, and the board is expected to vote next spring.
White said estimated compliance costs could top $3 billion over 11 years but maintained that the $60 billion-a-year construction industry "is certainly capable of absorbing the impacts."
He added, however, that both cost and a lack of readily available retrofitting devices -- combined with the need to include smog-reduction as well as soot-control devices -- meant cleanup would occur gradually.
John Hakel, vice president of the Associated General Contractors, which represents construction equipment fleet owners and general contractors, said late Tuesday that he had just received the report and could not comment on specifics. But he said the industry is dedicated to cleaning up equipment. He agreed it would be a costly and lengthy process and said state officials and the Union of Concerned Scientists report appeared to underestimate the sheer volume of construction equipment, which he estimated at 250,000 to 300,000 machines. The second study found that for every additional 10 micrograms of soot in a cubic meter of air, there was a 4.5% increase in heart attacks.
In areas like Salt Lake City or Greater Los Angeles, which can experience wide swings in air quality based on weather patterns, the risk of heart attack can be 10 times higher than normal on a bad air day, said Pope, who has done extensive research on the health effects of fine particles produced by diesel engines. Coauthor Dr. Jeffrey Anderson, a cardiologist whose patients were among more than 12,000 people with heart disease who participated in the short-term exposure study, said he was already changing his advice to patients based on the results, urging them to stay inside on bad air days or, in severe cases, to move to a more favorable climate.
