Carbonaceous aerosol measurements were conducted at the
Institute of Atmospheric Physics, Chinese Academy of Sciences in
Haidian District, Beijing City, China (39°580´N, 116°220´E)
(Figure 1). This site is located between the North Third Ring Road
and the North Fourth Ring Road. The apparatus used in this study
was installed on the roof of a two–story building (10 m above
ground). An automated weather station was placed at a distance of
10 m from the sampler. Meteorological data on temperature,
relative humidity and wind speed were recorded concurrently
(Figure 2).