Effect of time-activity adjustment on exposure assessment for traffic-related ultrafine particles.

ABSTRACT: Exposures to ultrafine particles (<100 nm, estimated as particle number concentration, PNC) differ from ambient concentrations because of the spatial and temporal variability of both PNC and people. Our goal was to evaluate the influence of time-activity adjustment on exposure assignment and associations with blood biomarkers for a near-highway population. A regression model based on mobile monitoring and spatial and temporal variables was used to generate hourly ambient residential PNC for a full year for a subset of participants (n=140) in the Community Assessment of Freeway Exposure and Health study. We modified the ambient estimates for each hour using personal estimates of hourly time spent in five micro-environments (inside home, outside home, at work, commuting, other) as well as pa

SUBMITTER: Lane KJ 

PROVIDER: S-EPMC4542140 | biostudies-literature | 2015 Sep-Oct

REPOSITORIES: biostudies-literature