Abstract: Diurnal variations of carbon monoxide concentrations and traffic density, exemplified in the literature as common for urban areas, were observed at ?curb-side? studies in Nashville, Tenn., and Cincinnati, Ohio. A new ...

Abstract: Five years of turbidity measurements from a network of stations in the United States are analyzed. Measurements are made with the Volz sunphotometer; the instrumentits calibration, and its use are described. The relationship ...