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Technical Papers

Measurement of microenvironmental ozone concentrations in Durham, North Carolina, using a 2B Technologies 205 Federal Equivalent Method monitor and an interference-free 2B Technologies 211 monitor

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Figures & data

Figure 1. The air pollution monitoring station (37-063-0015) at the Durham National Guard Armory.

Figure 1. The air pollution monitoring station (37-063-0015) at the Durham National Guard Armory.

Figure 2. Cart in operating mode.

Figure 2. Cart in operating mode.

Figure 3. Time-series plot of 1-min average Durham Armory Thermo 49C, 2B Techologies 205, and 2B Technologies 211 microenvironmental ozone concentrations (ppb) illustrating sequential visits to a car repair garage office (10:00 a.m.), an urban park restroom facility (11:00 a.m.), an outdoor location next to the outdoor Armory fixed-site monitor (11:15 a.m.), a fast-food restaurant during lunch (12:15 p.m.), a guitar and violin repair shop (1:15 p.m.), an art and frame shop (2:00 p.m.), a book store (3:15 p.m.), a record shop (4:00 p.m.), a pizzeria during dinner (5:00 p.m.), an ice cream shop (6:15 p.m.), a residence, indoors (7:15 p.m.), and a residence, outdoors (7:30 p.m.).

Figure 3. Time-series plot of 1-min average Durham Armory Thermo 49C, 2B Techologies 205, and 2B Technologies 211 microenvironmental ozone concentrations (ppb) illustrating sequential visits to a car repair garage office (10:00 a.m.), an urban park restroom facility (11:00 a.m.), an outdoor location next to the outdoor Armory fixed-site monitor (11:15 a.m.), a fast-food restaurant during lunch (12:15 p.m.), a guitar and violin repair shop (1:15 p.m.), an art and frame shop (2:00 p.m.), a book store (3:15 p.m.), a record shop (4:00 p.m.), a pizzeria during dinner (5:00 p.m.), an ice cream shop (6:15 p.m.), a residence, indoors (7:15 p.m.), and a residence, outdoors (7:30 p.m.).

Figure 4. Illustrative time-series plots of 1-hr average Durham Armory Thermo 49C, 1-min average 2B Tech 205, and 1-min 211 ozone concentrations (ppb) measured during household activities that included toasting and grinding spices during lunch preparation in kitchen (10:45 a.m.), cooking lunch on the kitchen gas stove (11:45 a.m.), briefly sampling outdoor air passing to (12:00 p.m.) and from (12:55 p.m.) test vehicle cabin outside the residence, sampling closed test vehicle cabin before and after installing an air freshener (12:30 and 12:45 p.m.), washing lunch cooking and dining utensils in the kitchen dish washer (1:15 p.m.), shampooing hair during a bathroom shower (1:40 p.m.), mopping the bathroom floor with a disinfectant cleaner (3:45 p.m.), and briefly sampling the ambient air outside the residence (5:05 p.m.).

Figure 4. Illustrative time-series plots of 1-hr average Durham Armory Thermo 49C, 1-min average 2B Tech 205, and 1-min 211 ozone concentrations (ppb) measured during household activities that included toasting and grinding spices during lunch preparation in kitchen (10:45 a.m.), cooking lunch on the kitchen gas stove (11:45 a.m.), briefly sampling outdoor air passing to (12:00 p.m.) and from (12:55 p.m.) test vehicle cabin outside the residence, sampling closed test vehicle cabin before and after installing an air freshener (12:30 and 12:45 p.m.), washing lunch cooking and dining utensils in the kitchen dish washer (1:15 p.m.), shampooing hair during a bathroom shower (1:40 p.m.), mopping the bathroom floor with a disinfectant cleaner (3:45 p.m.), and briefly sampling the ambient air outside the residence (5:05 p.m.).

Table 1. Descriptive statistics for ozone concentrations associated with indoor microenvironments

Table 2. Descriptive statistics for ozone concentrations associated with outdoor microenvironments

Table 3. Descriptive statistics for ozone concentrations associated with vehicle (in-car) microenvironments

Table 4. Comparison of descriptive statistics for ozone concentrations associated with open and closed indoor microenvironments

Table 5. Descriptive statistics for ozone concentrations associated with outdoor microenvironments with respect to road orientation

Table 6. Descriptive statistics by ventilation and engine status for ozone concentrations associated with vehicle microenvironments

Table 7. Comparison of ozone concentrations measured simultaneously by the model 205 and model 211 monitors and the fixed-site monitor at the Durham National Guard Armory

Table 8. Tests showing likely interference effects in the ozone measurements made by the model 205 monitor relative to the model 211 monitor

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