Research Projects

Project at a Glance

Project Status: complete

Report Published August 1996:

Title: Analysis of data from the Lynwood Carbon Monoxide Study

Principal Investigator / Author(s): Bowen, John

Contractor: Desert Research Institute

Contract Number: a032-184

Research Program Area: Atmospheric Processes

Topic Areas: Field Studies, Mobile Sources & Fuels


The air quality monitoring site at Lynwood (LYNN). operated by the South Coast Air Quality Management District (SCAQMD), has recorded the highest carbon monoxide (CO) concentrations in the South Coast Air Basin (SoCAB) and in the State of California.

In the winter of 1989-90, the Air Resources Board (ARB), the SCAQMD, and General Motors Research Laboratories (GMRL) sponsored an intensive field study to understand the sources and distribution of CO during stagnation periods in the SoCAB. Supplemental data were collected for 24 hours in December, 1989 (from 1200 PST on Tuesday, 19 December through 1200 PST on Wednesday, 20 December) and 40 hours in January, 1990 (from 1200 PST on Monday, 8 January through 0400 PST on Wednesday, 10 January). Bag samples were collected and analyzed for CO at several sites near Lynwood to characterize concentrations at the middle and neighborhood scales and at other sites in the western SoCAB to measure the extent of the CO cloud. Perfluorocarbon tracers were released at four locations near Lynwood and the collected bag samples analyzed for their presence. Meteorological variables were measured with tethersondes at Lynwood and Vernon to altitudes of 60 m above the ground. Traffic counts were measured at five surface street and six freeway locations. On-Road vehicle exhaust emissions were measured with an infrared, remote sensor at several locations in Lynwood and other sites in the SoCAB. CO analyzers were installed in rover vehicles to measure instantaneous CO concentrations on streets in the area.

The overall objectives of this study were to analyze data collected during the winter of 1989-90 and to determine: 1) why CO concentrations are higher at Lynwood than at any other monitoring location; 2) the relative contributions of local and area wide sources; and 3) the relative influence of meteorology, topography, and motor vehicle fleet characteristics on the CO concentrations at Lynwood.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

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