The major emphasis of this investigation centered on the collection of particulate and gaseous pollutant data, and detailed micrometeorological data in a non-urban setting adjacent to the heavily travelled Long Island Expressway. The purposes for collecting the data were to (1) document the distribution of sulfate, lead, total particulates and carbon monoxide at an array of sampling points adjacent to the highway; (2) study the micrometeorology associated with the highway, with special attention to those parameters important in the determination of atmospheric dispersion, (3) reevaluate highway air pollutant emission factors from data gathered in tracer gas experiments; and (5) examine the applicability of existing highway air pollutant dispersion models. The location of the sites and the experimental setup for collecting pollutant data are described, and details of the data acquisition procedures are presented.