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Estimation of citywide air pollution in Beijing.

Wang JF, Hu MG, Xu CD, Christakos G, Zhao Y - PLoS ONE (2013)

Bottom Line: Insight about the technique's spatial estimation accuracy (uncertainty) is gained by means of theoretical considerations and numerical validations involving real data.The technique was used to study citywide PM(2.5) pollution during the 423-day period of interest (May 10, 2010 to December 6, 2011).Finally, a freely downloadable software library is provided that performs all relevant calculations of pollution estimation.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China. wangjf@lreis.ac.cn

ABSTRACT
There has been discrepancies between the daily air quality reports of the Beijing municipal government, observations recorded at the U.S. Embassy in Beijing, and Beijing residents' perceptions of air quality. This study estimates Beijing's daily area PM(2.5) mass concentration by means of a novel technique SPA (Single Point Areal Estimation) that uses data from the single PM(2.5) observation station of the U.S Embassy and the 18 PM(10) observation stations of the Beijing Municipal Environmental Protection Bureau. The proposed technique accounts for empirical relationships between different types of observations, and generates best linear unbiased pollution estimates (in a statistical sense). The technique extends the daily PM(2.5) mass concentrations obtained at a single station (U.S. Embassy) to a citywide scale using physical relations between pollutant concentrations at the embassy PM(2.5) monitoring station and at the 18 official PM(10) stations that are evenly distributed across the city. Insight about the technique's spatial estimation accuracy (uncertainty) is gained by means of theoretical considerations and numerical validations involving real data. The technique was used to study citywide PM(2.5) pollution during the 423-day period of interest (May 10, 2010 to December 6, 2011). Finally, a freely downloadable software library is provided that performs all relevant calculations of pollution estimation.

Show MeSH
Relationship between stations and PM2.5 areal concentration: yi denotes PM10 concentration reported by station i, and X is areal PM2.5 concentration for Beijing; St. US denotes the U.S. Embassy station at which daily PM2.5 concentration x0 is observed; X is estimated by x0 using the SPA technique, based on observed PM2.5 data at the embassy station, and their correlation with PM10 concentrations observed at the 18 (evenly distributed) stations operated by BJ-EPB.
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pone-0053400-g002: Relationship between stations and PM2.5 areal concentration: yi denotes PM10 concentration reported by station i, and X is areal PM2.5 concentration for Beijing; St. US denotes the U.S. Embassy station at which daily PM2.5 concentration x0 is observed; X is estimated by x0 using the SPA technique, based on observed PM2.5 data at the embassy station, and their correlation with PM10 concentrations observed at the 18 (evenly distributed) stations operated by BJ-EPB.

Mentions: The objective of the SPA technique is to estimate citywide PM2.5 pollution in the Beijing area. The estimate is based on PM2.5 data from a single monitoring station at the U.S. Embassy in Beijing, and PM10 concentrations observations obtained at the official BJ-EPB monitoring network. Figure 2 outlines the SPA method.


Estimation of citywide air pollution in Beijing.

Wang JF, Hu MG, Xu CD, Christakos G, Zhao Y - PLoS ONE (2013)

Relationship between stations and PM2.5 areal concentration: yi denotes PM10 concentration reported by station i, and X is areal PM2.5 concentration for Beijing; St. US denotes the U.S. Embassy station at which daily PM2.5 concentration x0 is observed; X is estimated by x0 using the SPA technique, based on observed PM2.5 data at the embassy station, and their correlation with PM10 concentrations observed at the 18 (evenly distributed) stations operated by BJ-EPB.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3539974&req=5

pone-0053400-g002: Relationship between stations and PM2.5 areal concentration: yi denotes PM10 concentration reported by station i, and X is areal PM2.5 concentration for Beijing; St. US denotes the U.S. Embassy station at which daily PM2.5 concentration x0 is observed; X is estimated by x0 using the SPA technique, based on observed PM2.5 data at the embassy station, and their correlation with PM10 concentrations observed at the 18 (evenly distributed) stations operated by BJ-EPB.
Mentions: The objective of the SPA technique is to estimate citywide PM2.5 pollution in the Beijing area. The estimate is based on PM2.5 data from a single monitoring station at the U.S. Embassy in Beijing, and PM10 concentrations observations obtained at the official BJ-EPB monitoring network. Figure 2 outlines the SPA method.

Bottom Line: Insight about the technique's spatial estimation accuracy (uncertainty) is gained by means of theoretical considerations and numerical validations involving real data.The technique was used to study citywide PM(2.5) pollution during the 423-day period of interest (May 10, 2010 to December 6, 2011).Finally, a freely downloadable software library is provided that performs all relevant calculations of pollution estimation.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China. wangjf@lreis.ac.cn

ABSTRACT
There has been discrepancies between the daily air quality reports of the Beijing municipal government, observations recorded at the U.S. Embassy in Beijing, and Beijing residents' perceptions of air quality. This study estimates Beijing's daily area PM(2.5) mass concentration by means of a novel technique SPA (Single Point Areal Estimation) that uses data from the single PM(2.5) observation station of the U.S Embassy and the 18 PM(10) observation stations of the Beijing Municipal Environmental Protection Bureau. The proposed technique accounts for empirical relationships between different types of observations, and generates best linear unbiased pollution estimates (in a statistical sense). The technique extends the daily PM(2.5) mass concentrations obtained at a single station (U.S. Embassy) to a citywide scale using physical relations between pollutant concentrations at the embassy PM(2.5) monitoring station and at the 18 official PM(10) stations that are evenly distributed across the city. Insight about the technique's spatial estimation accuracy (uncertainty) is gained by means of theoretical considerations and numerical validations involving real data. The technique was used to study citywide PM(2.5) pollution during the 423-day period of interest (May 10, 2010 to December 6, 2011). Finally, a freely downloadable software library is provided that performs all relevant calculations of pollution estimation.

Show MeSH