aThis regulatory impact assessment (RIA) also included an evaluation of a proposed regional haze rule; however, because the PM and ozone analyses were more closely related to the committee’s task, the committee focused on these analyses.

bMany health effects were listed as unquantified for ozone and PM in all three RIAs. Unquantified health effects were also listed for carbon monoxide (CO) and hazardous air pollutants in Tier 2 rule-making, and for sulfur dioxide, nitrogen oxides, CO, and nonmethane hydrocarbons in heavy-duty engine and diesel-fuel rule-making.

Abbreviations: PM, particulate matter; NAAQS, National Ambient Air Quality Standards; COPD, chronic obstructive pulmonary disease.

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