The Near-Road Ambient Monitoring Network and Exposure Estimates for Health Studies.

The transport sector is the largest source of NOx and CO emissions, and among the largest sources of PM2.5 and VOCs. As a result of EPA's new near-road monitoring requirements, high-quality measurements of ambient NO2, CO, and PM2.5 concentrations will be available from more than 120 sites adjacent to major roads in over 100 cities nationwide in the next few years. This article discusses how data from the new network will provide opportunities to further develop, calibrate, and verify exposure assessment methods and models.