I don't see how they miscalculated if the number they were using was valid a few years ago.
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READ the article. The UC - Berkeley professor and the scientists
from Lawrence Berkeley National Lab found that the numbers they
were using a few years ago were NOT VALID. For example, they
cite that the values that CARB had been using a few years ago
for nitrous oxide were OFF by a factor of 4.5!!!!! Particulate
matter was off by a factor of 3.1.
That's the problem, CARB has been giving the California legislature
BAD, INACCURATE, WRONG data for years.
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2010/10/07/BAOF1FDMRV.DTL&ao=3"The problem, and the revised counting method, came to light after Robert Harley, a UC Berkeley professor of environmental engineering, and a colleague at Lawrence Berkeley National Laboratory did their own evaluation, which was published in December in the journal Atmospheric Environment.
While air board officials and other defenders of the board's science point to the economy as a major factor in the overestimates, Harley found that prior to the recession the board's estimates of nitrous oxide were too high by a factor of 4.5 and its estimate of particulate matter was off by a factor of 3.1, an extraordinarily high amount to be off scientifically.
"The difference is large enough that it changes policy," Harley said."
Dr. Greg