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Drivers can breathe a sigh of relief.
The AAA on Wednesday released a report suggesting emissions from cars and trucks are not the primary cause of smog. The bulk of air pollution comes not from vehicles but from factories, power plants and refineries, the report states. The AAA's figures show automobile emissions have decreased to the point where only 25 percent of smog-causing pollutants now come from cars and light trucks. This report says it's not their fault. The Environmental Protection Agency does not dispute the numbers in the report and concedes that automobiles are much cleaner today than they were 30 years ago.