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A new EPA proposal would lower the current national ozone standard for automobiles from 75 parts per billion (ppb) to 65 or 70 ppb. Environmentalist are calling for even more stringent pollution caps. (Associated Press)
Photo by: Nick Ut
A new EPA proposal would lower the current national ozone standard for automobiles from 75 parts per billion (ppb) to 65 or 70 ppb. Environmentalist are calling for even more stringent pollution caps. (Associated Press)

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