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Portable air sampling systems and methods are provided for
intermittently sampling air in the breathing zone of a person over
extended periods of time. Air sampling system performance can be
continuously measured and recorded within a data logger. In
addition, physical activity levels of a person wearing a portable
air sampling system can be continuously monitored and recorded
within the data logger. Air sampling system performance monitoring
includes measuring pressure drop across a filter and measuring
temperature of air flowing through the filter. Physical activity
levels of a person can be monitored easily and non-intrusively by
measuring changes in electrical capacitance of a transducer
maintained in close proximity to the person.