As expected, the EPA has announced a new standard for ground-level ozone emissions, 75 parts per billion. From the EPA fact sheet:
On March 12, 2008, EPA significantly strengthened its national ambient air quality standards (NAAQS) for ground-level ozone, the primary component of smog. These changes will improve both public health protection and the protection of sensitive trees and plants.
• EPA is revising the 8-hour “primary” ozone standard, designed to protect public health, to a level of 0.075 parts per million (ppm). The previous standard, set in 1997, was 0.08 ppm. Because ozone is measured out to three decimal places, the standard effectively became 0.084
ppm as a result of rounding.
• EPA is also strengthening the secondary 8-hour ozone standard to the level of 0.075 ppm making it identical to the revised primary standard. EPA decided to strengthen the secondary ozone standard after concluding that the 1997 secondary standard is not adequate to protect public welfare. Current ozone air quality concentrations in many areas of the country —
including some areas that meet the 1997 ozone standards — are high enough to harm sensitive
vegetation and ecosystems.
More from the EPA here.
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