Miscalculations on Unemployment:
TO DO: Find examples of multiple GAO revisions made after the passage of policy
Miscalculations on Pollution:
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.
Overestimate fueled state’s landmark diesel law, Wyatt Buchanan, Chronicle Sacramento Bureau, San Francisco Chronicle October 8, 2010 04:00 AM (link)