Assessing spatial and temporal variability of VOCs and PM-components in outdoor air during the Detroit Exposure and Aerosol Research Study (DEARS)

► Linear mixed models can be used to identify influences to measurement variance. ► Variance observed for VOCs is largely explained by seasonal and regional effects. ► Effects on variance from large-emission sources are limited to some PM components. ► Central sites do not show the spatial/temporal trends of PM components in Detroit.