 |
| Titel |
Use of a mobile laboratory to evaluate changes in on-road air pollutants during the Beijing 2008 Summer Olympics |
| VerfasserIn |
M. Wang, T. Zhu, J. Zheng, R. Y. Zhang, S. Q. Zhang, X. X. Xie, Y. Q. Han, Y. Li |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 21 ; Nr. 9, no. 21 (2009-11-03), S.8247-8263 |
| Datensatznummer |
250007724
|
| Publikation (Nr.) |
 copernicus.org/acp-9-8247-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| China implemented systematic air pollution control measures during the 2008
Beijing Summer Olympics and Paralympics to improve air quality. This study
used a versatile mobile laboratory to conduct in situ monitoring of on-road air
pollutants along Beijing's Fourth Ring Road on 31 selected days before,
during, and after the Olympics air pollution control period. A suite of
instruments with response times of less than 30 s was used to measure
temporal and spatial variations in traffic-related air pollutants, including
NOx, CO, PM1.0 surface area (S(PM1)), black carbon (BC), and
benzene, toluene, the sum of ethylbenzene, and m-, p-, and o-xylene (BTEX).
During the Olympics (8–23 August, 2008), on-road air pollutant
concentrations decreased significantly, by up to 54% for CO, 41% for
NOx, 70% for SO2, 66% for BTEX, 12% for BC, and 18%
for SPM1, compared with the pre-control period (before 20 July).
Concentrations increased again after the control period ended (after 20
September), with average increases of 33% for CO, 42% for NOx,
60% for SO2, 40% for BTEX, 26% for BC, and 37% for
S(PM1), relative to the control period. Variations in pollutants
concentrations were correlated with changes in traffic speed and the number
and types of vehicles on the road. Throughout the measurement periods, the
concentrations of NOx, CO, and BTEX varied markedly with the numbers of
light- and medium-duty vehicles (LDVs and MDVs, respectively) on the road.
Only after 8 August was a noticeable relationship found between BC and
S(PM1) and the number of heavy-duty vehicles (HDVs). Additionally, BC
and S(PM1) showed a strong correlation with SO2 before the
Olympics, indicating possible industrial sources from local emissions as
well as regional transport activities in the Beijing area. Such factors were
identified in measurements conducted on 6 August in an area southwest of
Beijing. The ratio of benzene to toluene, a good indicator of traffic
emissions, shifted suddenly from about 0.26 before the Olympics to
approximately 0.48 after the Olympics began. This finding suggests that
regulations on traffic volume and restrictions on the use of painting
solvents were effective after the Olympics began. This study demonstrated
the effectiveness of air pollution control measures and identified local and
regional pollution sources within and surrounding the city of Beijing. The
findings will be invaluable for emission inventory evaluations and model
verifications. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|