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Title:
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Report on the activities of the international consultant, Prof. J. Slanina, in the project "Capacity development for NOx pollution control in Guangzhou"
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Author(s):
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Published by:
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Publication date:
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ECN
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1-12-1998
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ECN report number:
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Document type:
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ECN-C--98-108
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ECN publication
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Number of pages:
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Full text:
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30
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Download PDF
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Abstract:
The very fast economic growth of China in the last decade has led to anexponential increase of the number of cars and lorries and hence has
introduced the well known air pollution problems of many cities elsewhere in
the world. Very high NOx concentrations are being reached in Guangzhou up to
450 mug.m"-3, in fact the Dutch limit (hourly value, median concentration)
is around 100 mug.m"-3. The same goes for CO, the limit there is set to 6
mg.m"-3 (98 percentile, 8 hours average). Values of 25 mg.m"-3 are reported
for Dongfeng street in Guangzhou. In Guangzhou ozone concentrations are
observed between 110 and 240 mug.m"-"1, leading to transgressions of 37%,
18 % and 8% of the Chinese Air Quality standards for class 1, class 2 and
class 3 requirements respectively. Measurements of emissions of different car
types and of the driving cycle, as specified by the proposal, have been
carried out. The initial assessment of emissions in Guangzhou based on
driving cycle and emission rates leads to the conclusion that 39,000 tons of
NOx and 403,000 tons of CO are emitted. The stations to measure local air
quality in Guangzhou are in place. Not only CO and NOx have been measured,
but a number of other compounds too. Also a survey in main streets of
Guangzhou was carried out. Average concentrations of 173 to 700 mug.m"-"1
NOx were found and 3 to 10 mg.m"-"1 CO. Measurements have been carried out to
characterize dispersion of traffic emissions as a function of height. These
measurements are very important because they offer insight in the dispersion
parameters, necessary information to develop effective dispersion models. The
ozone network has very effectively produced results indeed. The proof has
been delivered that ozone in Guangzhou is not only produced by local
emissions of VOC and NOx but that regional contributions are also very
important. Further quantification of local and regional contributions will
depend on more monitoring results and the use of models. The proposed
measurements have been carried out with very good results and the
collaboration of the three involved Chinese institutes has proven to be very
effective. 5 refs.
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