The FHWA and EPA collaborated on a research effort to characterize the impact and behavior of particulate matter with aerodynamic diameter less than 2.5 microns (PM2.5), MSATs near highways and other pollutants primarily emitted from motor vehicles such as CO, NO, NO2, NOX and BC. Additional data analysis will be required over the coming months to adequately assess the significance and implications of the results of this study.
