Uncertainty associated with ambient ozone metrics in epidemiologic studies and risk assessments.

ABSTRACT: Epidemiologic studies relating ambient ozone concentrations to adverse health outcomes have typically relied on spatial averages of concentrations from nearby monitoring stations, referred to as "composite monitors." This practice reflects the assumption that ambient ozone concentrations within an urban area are spatially homogenous. We tested the validity of this assumption by comparing ozone data measured at individual monitoring sites within selected US urban areas to their respective composite monitor time series. We first characterized the temporal correlation between the composite monitor and individual monitors in each area. Next, we analyzed the heteroskedasticity of each relationship. Finally, we compared the distribution of concentrations measured at individual monitors to the co

SUBMITTER: Wells B 

PROVIDER: S-EPMC7321928 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature