Co And Sp2

As for NOx, combustion sources such as gas stoves and kerosene heaters can be significant sources of indoor CO. Figure 15.7, for example, shows measured

CO concentrations in eight mobile homes with unvented kerosene heaters either off or on (Mumford et al., 1991). Both the hourly average and peak 1-h concentrations are shown for the situation with the heater on, whereas only the f-h average for the heater off is shown. Also shown are the United States 1- and 8-h standards and the Occupational Safety and Health Adminstration (OSHA) 8-h standard. In three of the homes, the average CO concentrations exceeded the 8-h standard and in one home, the 1-h ambient air and OSHA standard was exceeded.

The ratio of indoor to outdoor concentrations of CO in homes using gas stoves has been measured to be 1.2-3.8 (Wade et al., 1975), with the highest ratios found close to the source. Similarly, higher CO levels indoors compared to outdoors have been reported for restaurants in Korea, with those using charcoal burners as well as gas giving much higher concentrations (Baek et al., 1997). Figure 15.8, for example, shows the mean indoor-to-outdoor concentrations of CO and some other air pollutants measured in restaurants in Korea using either gas only or a combination of gas and

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