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SW: →‎CO and smog: - add section
:Simplified, the net effect of the ozone cycle is:
::CO + 2O<sub>2</sub> → CO<sub>2</sub> + O<sub>3</sub>
==Regulation==
The EPA Office of Air Quality Planning and Standards (OAQPS) has set National Ambient Air Quality Standards under the [[Clean Air Act]] for six principal pollutants, which are called "criteria" pollutants: [[sulfur dioxide]], [[particulate matter]], [[nitrogen oxides]], [[ozone]], [[lead]], and [[carbon monoxide]]. After the EPA sets or revises each standard and a timeline for implementation, the responsibility for meeting the standard falls to the states. Each state must submit an EPA-approved plan that shows how it will meet the standards and deadlines. These state plans are known as State Implementation Plans (SIPs)." <ref>[http://www.sierraclub.org/cleanair/sips/NAAQS.PDF "NAAQS"] Sierra Club, accessed July 2010.</ref>
==Resources==
