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Comparison of exposure estimation methods for air pollutants: Ambient monitoring data and regional air quality simulation
Journal article   Open access

Comparison of exposure estimation methods for air pollutants: Ambient monitoring data and regional air quality simulation

Mercedes A Bravo, Montserrat Fuentes, Yang Zhang, Michael J Burr and Michelle L Bell
Environmental Research, Vol.116, pp.1-10
07/2012
DOI: 10.1016/j.envres.2012.04.008
PMCID: PMC3543158
PMID: 22579357
url
https://www.ncbi.nlm.nih.gov/pmc/articles/3543158View
Open Access

Abstract

Air quality modeling could potentially improve exposure estimates for use in epidemiological studies. We investigated this application of air quality modeling by estimating location-specific (point) and spatially-aggregated (county level) exposure concentrations of particulate matter with an aerodynamic diameter less than or equal to 2.5 μm (PM ) and ozone (O ) for the eastern U.S. in 2002 using the Community Multi-scale Air Quality (CMAQ) modeling system and a traditional approach using ambient monitors. The monitoring approach produced estimates for 370 and 454 counties for PM and O , respectively. Modeled estimates included 1861 counties, covering 50% more population. The population uncovered by monitors differed from those near monitors (e.g., urbanicity, race, education, age, unemployment, income, modeled pollutant levels). CMAQ overestimated O (annual normalized mean bias=4.30%), while modeled PM had an annual normalized mean bias of −2.09%, although bias varied seasonally, from 32% in November to –27% in July. Epidemiology may benefit from air quality modeling, with improved spatial and temporal resolution and the ability to study populations far from monitors that may differ from those near monitors. However, model performance varied by measure of performance, season, and location. Thus, the appropriateness of using such modeled exposures in health studies depends on the pollutant and metric of concern, acceptable level of uncertainty, population of interest, study design, and other factors. ► Evaluates air quality modeling to generate exposure estimates in health studies. ► Compares population coverage for exposures from observations vs. model results. ► Population far from monitors was less urban with lower income, less education. ► Model results provide greater spatial, temporal resolution, and include more people. ► Model performance varies by season, region, metric; should influence study design.
 Ozone Health assessment CMAQ Community multiscale air quality model Exposure assessment PM2.5

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