Considerations in the use of ozone and PM(2.5) data for exposure assessment

The US national ambient-air monitoring network, created to verify compliance with health-based standards, now doubles as an important source of exposure data for the epidemiological analyses on which these standards increasingly rest, particularly in the case of ozone and PM(2.5). This paper was written for a workshop called to facilitate and inform the use of routine ozone and PM(2.5) data by the Environmental Public Health Tracking Network. It examines the fit between priorities that shape regulatory monitoring and modeling and the data needs of public health tracking.