The Environmental Protection Agency's proposal to tighten the country's safety standard for ground-level ozone from 75 parts per billion to between 60 and 70 parts per billion is being criticized by lawmakers and businesses. The EPA said the tougher standard could save as many as 12,000 lives annually and lead to about $100 billion each year in medical savings by 2020. However, some lawmakers fear that the proposal would increase costs for businesses already struggling with the economic downturn.

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