Sounds amazingly like all the global warming scandals that have surfaced over the past two years. Please note everyone: Scientists (even "consensus" ones) are not infallible human beings; they have political inclinations which CAN AND DO (sometimes) bias their research.
Please don't fall for the arrogant liberal maxim that says normal, "uneducated" folk are unintelligent morons who can't think their way out of a paper sack. Common sense is sometimes useful in sniffing out the rats in one's science.
California grossly miscalculated pollution levels in a scientific analysis used to toughen the state's clean-air standards, and scientists have spent the past several months revising data and planning a significant weakening of the landmark regulation, The Chronicle has found.
The pollution estimate in question was too high - by 340 percent, according to the California Air Resources Board, the state agency charged with researching and adopting air quality standards. The estimate was a key part in the creation of a regulation adopted by the Air Resources Board in 2007, a rule that forces businesses to cut diesel emissions by replacing or making costly upgrades to heavy-duty, diesel-fueled off-road vehicles used in construction and other industries.