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We measured ultrafine particulate material (UFPM) number concentrations in a variety of indoor, personal and mobile environments, using a P-Trak condensations particle counter (TSI model 8525). Indoor UFPM levels indicated influx of outdoor air plus indoor combustion sources (e.g. toasting and cooking, yielding UFPM concentrations >5 particles/cm3). Influx of UFPM into the indoor environment from unexpected sources (e.g. a home pottery kiln) was readily detected. In a moving passenger car environment, prolonged exposures to UFPM concentrations >1 particles/cm3 were observed related to heavy traffic, especially diesel vehicles. Data logging at 1 s revealed transient UFPM peaks not demonstrable with longer interval averaging. Indices of continuous, average and cumulative exposures are presented. This type of sensitive and portable instrumentation should be highly useful in studies of UFPM in mobile and personal micro-environments.

annals of occupational hygiene

Ultrafine Particulate Exposures in Indoor, Outdoor, Personal and Mobile Environments: Effects of Diesel, Traffic, Pottery Kiln, Cooking and HEPA Filtration on Micro-Environmental Particle Number Concentration