TRJ Environmental

Microenvironmental Studies

Indoor BTEX vs. Ventilation Conditions. Ted Johnson designed Scripted House Studies in Research Triangle Park, NC, and Columbus, Ohio, that measured BTEX levels inside furnished houses as air exchange rates were varied according to prepared scripts. Ted Johnson developed the scripts and conducted in-depth statistical analyses of the data obtained from each study.

Benzene Indoor/Outdoor Ratios. Ted Johnson designed the Benzene Indoor/Outdoor Study, a field study in Cincinnati that measured indoor/outdoor ratios of benzene in residences without indoor emission sources.

MTBE Concentrations at Service Stations. Ted Johnson directed the MTBE Service Station Study, a field study that measured concentrations of MTBE, BTEX, formaldehyde, and carbon monoxide at ten service stations in the Northeast U.S. Measurements were made at the station perimeters and in the breathing zones of customers and employees.

Baltimore TEAM Study. Ted Johnson managed data analysis efforts supporting the Total Exposure Assessment Methodology (TEAM) Study conducted in Baltimore. The TEAM study collected and analyzed indoor and outdoor data for a variety of volatile organic compounds. Data analysis included inter-pollutant correlations, stepwise regression of pollutant concentration versus selected explanatory variables, and indoor/outdoor ratios.

Ozone Concentrations in Motor Vehicles. Ted Johnson directed the Vehicle Ozone Study, a field study that measured ozone concentrations inside and outside of motor vehicles under a variety of operating conditions.

Ozone Concentrations Near Roadways. Ted Johnson directed the Roadside Ozone Study, a field study in Cincinnati that measured ozone, nitrogen dioxide, and carbon dioxide concentrations at various distances from roadways.

Window Positions in Residences and Motor Vehicles. Ted Johnson recently directed two Window Position Studies in the Research Triangle area. In one study, Tom Long monitored the position of windows in motor vehicles under varying conditions. In the other study, Tom Long surveyed the position of residential windows under varying conditions. These studies provide useful data for estimating window position and associated air exchange rates in exposure models.

High-Exposures to Mobile Source Pollutants. Ted Johnson assisted the Desert Research Institute in designing an EPA-mandated field study to measure various mobile source pollutants (including MTBE, formaldehyde, and BTEX) in selected high-exposure microenvironments. Measurement locations included cities with and without oxygenated fuels.

Residential Exposures During Cooking. Tom Long analyzed data from the Residential Indoor Cooking Exposure (RICE) Study, measuring exposure to particles and gases in a test house during cooking events. He wrote programs to perform statistical analyses on continuous monitoring data, to calculate pollutant emission rates, and to format the results for inclusion in the project report.