Microscale Variations in Ambient Concentrations of Pollutants in St. Louis Air

摘要

As part of the Regional Air Pollution Study, a series of studies were carried out in St. Louis during the summers of 1974, 1975, and 1976 primarily to determine the subgrid concentrations of ambient air pollution. One primary pollutant gas, CO, and one secondary pollutant gas, ozone, were chosen to be representative. The methodology for determining subgrid concentration variations of these gases is discussed. Portable monitors and the collection and analysis of bag samples were used to determine pollutant concentrations. In some cases the monitors were moved along selected paths while the measurements were made; in other cases the monitors were placed at selected subgrid locations. The data were collected at six sites during the first year, and at two sites during the final two years. Both urban and rural sites were selected. All the data were collected during daylight hours, generally between 10:00 a.m. and 4:00 p.m.