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EPA Proposes Tough Smog Standard Businesses Call Too Costly

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The U.S. Environmental Protection Agency proposed tighter limits on emissions of smog-producing ozone, rules designed to reduce asthma and heart disease that critics said they may be among the costliest ever issued by the agency.

The EPA published a proposal today for ground-level ozone, offering to tighten the levels to 65-70 parts per billion, from the current 75 parts per billion for an eight-hour period. That change could prevent almost 1 million asthma attacks and an equivalent number of missed school days, the agency estimated.