For the next few months, nine Los Angeles volunteers will wear portable carbon monoxide detectors 24 hours per day to determine the levels to which they are being exposed. If the Environmental Protection Agency (EPA) experiment yields valid results, there will be a follow-up study "involving several hundred persons to map the carbon monoxide distribution among the general population."
Of course, many communities already have air monitoring equipment to measure representative carbon monoxide levels. "However," says the EPA, "they are usually located on roofs of buildings. We are conducting this study because there is a need for accurate ground level readings to help determine the higher concentrations that people may be exposed to as they move from location to location."
So the volunteers will monitor their exposure while riding, cycling, or walking; working indoors or out in several environments; being physically active or sleeping. At the same time, they will