The landfill mainly deals with MSW that originate from several districts
of Beijing. The compacted waste is covered with an HDPE
membrane, except for the working face (i.e., the open cell), which
often causes serious odor pollution to surrounding communities.
Sampling campaigns were conducted at the working face of the
landfill on selected days in different seasons from 2012 to 2014
(Table 2). Air samples at a height of 1.5 m above the surface (i.e.,
breathing zone) of the working face were withdrew to 8 L
bio-oriented polyester odor free bags (Environmental Science and
Technology Development Co., Ltd., China) through a specially
designed sampler. Detailed sampling method was described by
the authors elsewhere (Duan et al., 2014). Meteorological data
including temperature, wind speed, and humidity were also
recorded during sampling. All the samples were taken to the laboratory
and analyzed within 24 h. A total of 42 gas samples were
taken and analyzed during this 2-yearlong sampling campaign.