"Based on extensive
recent scientific evidence about the harmful effects of ground-level
ozone, or smog, EPA is proposing to strengthen air quality standards to
within a range of 65 to 70 parts per billion (ppb) to better protect
Americans’ health and the environment, while taking comment on a level
as low as 60 ppb. The Clean Air Act requires EPA to review the standards
every five years by following a set of open, transparent steps and
considering the advice of a panel of independent experts. EPA last
updated these standards in 2008, setting them at 75 ppb..."
EPA, air pollution, smog standards
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