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2026. 6. 30. 작업

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15 ppm of CO levels inside car

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This NIH (National Institutes of Health) Study monitoring CO inside the cabin of a vehicle during commutes over an extended period has some pretty interesting data. From the study the mean CO concentration was 9.8 ppm, with a standard deviation of 5.8 ppm Here is another study Here is another study that reflects older data ('80's and '90's) sampled from several metro areas that you may be familiar with. I discovered some additional studies that would show cars idling on warmup with the vent sent to 'fresh air' in the winter where the CO levels went as high as 8,000 ppm! So it seems that are within normal operation limits or that your exposure to CO does not seem out of the normal variance. It would be interesting to measure the CO with fresh air on driving in the country far from normal metropolitan contaminants.