Figure 1.

Representative plot of a maternal prenatal personal exposure assessment. This figure demonstrates personal carbon monoxide (CO) exposures (in parts per million) plotted against time, for a 72-hour exposure assessment period. The Lascar EL-CO-USB Data Logger measured CO levels every 10 seconds and was worn in the participant’s breathing zone. Peaks correspond to reported cooking periods; CO exposures outside of these periods were largely zero. Data for this study used the first 48 hours, to avoid cases where battery issues or field pick up schedules could have resulted in missing a cooking event on the last day. For this session, the 48-hour average CO exposure is 1.01 ppm (range, 0–94.65 ppm).