m in which airborne particulate matter is present. The lower the ceilin
g is, the higher the density of pollutants which then mix with the cleaner air.
With a low mixing layer, Taihang mountain range to the west and the Yanshan mountai
n range to the north serve as walls that form a semi-closed “room” in the Beijing-Tianjin-Hebei cluster.
The high level of emissions is the major reason for air pollution in th
e greater Beijing area, and meteorological conditions also play a key role as an exte
rnal factor, said Xu Xiangde, a researcher at the Chinese Academy of Meteorological Sciences.
Zhang Xiaoye, Xu’s colleague, said the “marked effect” of continuous pollutant accu
mulation on meteorological conditions could make overall pollution even worse.
“After the accumulation reaches a certain level, it will further wor
sen the meteorological conditions, which then will further affect air quality, causing explosive
rd phases, with 1,000 booths booked by 650 enterprises from 38 countries and regions.
The first phase of the import exhibition has 616 booths displaying electronics and home appliances, build
ing materials and hardware and mechanical equipment. There will be 384 booths in the third phase, m
ainly displaying food and beverage products, household goods, fabrics and home textiles.
Xu Bing, a spokesperson for the Canton Fair, said on Sunday that the 124t
h fair received exhibitors from ten countries and regions. According to Xu, a chamber of com
merce from Istanbul said the fair had helped many Turkish enterprises explore the global market.
“Design for trade” will be a highlight at the upcoming fair. About 100 design companies and institut
ions from 15 countries and regions, including the United States, Germany, France, Italy, Austr
alia, the Republic of Korea and Japan, have registered to participate in the design exhibition at the fair.