[Status and distribution of atmospheric ultrafine particles during Olympics Games in Beijing].
Beijing Da Xue Xue Bao Yi Xue Ban
; 42(3): 335-9, 2010 Jun 18.
Article
en Zh
| MEDLINE
| ID: mdl-20559412
ABSTRACT
OBJECTIVE:
To understand the characteristics of size and concentration of the ultrafine particles (UFPs) during the 2008 Olympics in Beijing, as well as the influencing factors for number concentration of UFPs.METHODS:
Ultrafine particle monitor model 3031, manufactured by USA TSI Co., was used to monitor the daily number concentration of 20-500 nm particles, and descriptive analysis was conducted based on the data collected.RESULTS:
During the Olympics, the mean value of number concentration for 20-100 nm particulate matter is 5 920.43 particles/ cm3. Particles ranging 30-50 nm account for the largest portion(23.49%) among particles of all sizes. There are two peak values on the curve of 24 hours' number concentration for 20-100 nm particles, respectively, at noon and evening.CONCLUSION:
This paper indicates that the number concentration of ultrafine particles registered considerable reduction in the 2008's Olympics compared to the pre-Olympics years. And observation of the curves indicated that the number concentrations of the UFPs with bigger size are related to traffic volume, whereas for smaller size UFPs, illumination may be a more important influencing factor. Also there are significant correlations between number concentration and temperature as well as relative humidity.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Deportes
/
Monitoreo del Ambiente
/
Contaminantes Atmosféricos
/
Material Particulado
Tipo de estudio:
Prognostic_studies
País/Región como asunto:
Asia
Idioma:
Zh
Revista:
Beijing Da Xue Xue Bao Yi Xue Ban
Asunto de la revista:
MEDICINA
Año:
2010
Tipo del documento:
Article
País de afiliación:
China