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| Titel |
Elucidating multipollutant exposure across a complex metropolitan area by systematic deployment of a mobile laboratory |
| VerfasserIn |
I. Levy, C. Mihele, G. Lu, J. Narayan, N. Hilker, J. R. Brook |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 14 ; Nr. 14, no. 14 (2014-07-16), S.7173-7193 |
| Datensatznummer |
250118887
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| Publikation (Nr.) |
 copernicus.org/acp-14-7173-2014.pdf |
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| Zusammenfassung |
| This study evaluates a deployment strategy of a heavily instrumented mobile
lab for characterizing multipollutant spatial patterns based upon a limited
number of measurement days spread over different seasons. The measurements
obtained through this deployment strategy are used to gain insight into
average pollutant levels between routine monitoring sites and in relation to
emission sources in the region, as well as to assess correlations between
pollutant patterns to better understand the nature of urban air pollutant
mixtures. A wide range of locations were part of the deployment in order to
characterize the distribution of chronic exposures potentially allowing
development of exposure models. Comparison of the mobile lab averages to the
available adjacent air quality monitoring network stations to evaluate their
representativeness showed that they were in reasonable agreement with the
annual averages at the monitoring sites, thus providing some evidence that,
through the deployment approach, the mobile lab is able to capture the main
features of the average spatial patterns. The differences between mobile lab
and network averages varied by pollutant with the best agreement for
NO2 with a percentage difference of 20%. Sharp differences in the
average spatial distribution were found to exist between different
pollutants on multiple scales, particularly on the sub-urban scale, i.e.,
the neighborhood to street scales. For example, NO2 was observed to be
210–265% higher by the main highway in the study region compared to the
nearby urban background monitoring site, while black carbon was higher by
180–200% and particle number concentration was 300% higher. The
repeated measurements of near-roadway gradients showed that the rate of
change differed by pollutant with elevated concentrations detected up to
600–700 m away for some pollutants. These results demonstrate that
through systematic deployment mobile laboratory measurements can be used to
characterize average or typical concentration patterns, thus providing data
to assess monitoring site representativeness, spatial relationships between
pollutants, and chronic multipollutant exposure patterns useful for
evaluating and developing exposure models for outdoor concentrations in an
urban environment. |
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