National Ambient Air Quality Standards
Consideration of substance toxicity and exposure pathways is a central principle of many ambient air quality standards. NCASI has been asked to take a larger role in collaborating in substance toxicity evaluations and in risk analysis approaches that drive policy decision making. Review of population-based epidemiology studies used as justification for lowering NAAQS standards is a particular focus of NCASI work. The goal of this work is to produce near-term, mid-term, and long-term technical products that may be used to improve the scientific process of NAAQS policy setting, specifically by advancing systematic review approaches that ensure that relevant, high-quality studies are used to inform the NAAQS policy setting process.