Issue Date: August 22, 2011
Carbon Monoxide Standards Retained
The existing national air quality standards for carbon monoxide adequately protect public health and the environment, EPA said last week in announcing its decision to retain the 40-year-old rules. Since 1980, levels of CO in the air have fallen by 80%, mostly as a result of motor vehicle emissions controls, the agency said. The current health standards are 9 ppm measured over eight hours and 35 ppm measured over one hour. “CO levels at . . .
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