recent studies of urban air pollution over the greater beijing area meigen zhang (state key...
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Recent Studies of Urban Air Pollution over the Greater
Beijing Area
Meigen ZHANG
(State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences)
March 10, 2003
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Basic Information
– 13.8 million residents in 16807 km2
– 27 million tons of Coal / yr27 million tons of Coal / yr– 2 million tons of low S coal2 million tons of low S coal– 700 million m700 million m33 of natural gas of natural gas – 1.849 million vehicles in Aug. 2002 (1.31million in 1
998)– Sand storms in spring
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Heating season Yearly average No heating season
Yearly average concentrations of SO2 in the suburb of Beijing in the period of 1984-2000
Spike: 1987,1992 and 1997Emission control: 1998--
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Daily average concentrations of SO2 in the suburb of Beijing in the period of 1997.01-2001.02
1. Seasonal variation2. Effect of SO2 emission control
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Heating season Yearly average No heating season
Yearly average concentrations of NOx in the suburb of Beijing in the period of 1981-2000
Fast increase after 1989Emission control: 1998-
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Daily average concentrations of NOx in the suburb of Beijing in the year of 2001
NO2/NOx ~ 1
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Heating season
No heating seasonYearly average
Yearly average concentrations of TSP in the suburb of Beijing in the period of 1981-2000
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Daily average concentrations of TSP in the suburb of Beijing in the period of 1997.01-2001.06 (unit: mg/m3)
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Chemical composition of TSP sampled in a park in Beijing during the period from June 23 to July 3 of 2000
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Daily average concentrations of PM10 in the suburb of Beijing in the period of 1999.01-2001.06 (unit: mg/m3)
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Daily average concentrations of TSP and PM10 and their ratios in the suburb of Beijing in the period of 1999.01-2001.06
PM10/TSP is higher in the period of May ~ October than in other time
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The ratios of chemical composition in PM2.5 and PM10 in Beijing in 2000
The ratios of SO42-, NO3
-,NH4+,OC and EC > 0.5
Ca, Al and Fe < 0.5
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Chemical compositions of PM2.5 in the winter and summer of Beijing
2000, 01, 20 Dosi Si te
55ug/ m3
OC51%
EC4%
SO415%
NO39%
Cl5%
Na2%
NH49%Other
5%
OC35%
EC3%
Nitrate5%
Sulfate19%
Ammonium5%
CL1%
Crustal20% Trace
1% Other11%
1999, 6, 13-14 1999, 6, 13-14
118.19 ug/m118.19 ug/m33
Pollution caused by organic compounds becomes severe
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PM2.5 and its chemical compositions PM2.5 and its chemical compositions Dongsi and PKU sites, January 20, 2000Dongsi and PKU sites, January 20, 2000
Peking Univ.
66 ug/m3
Pollution caused by organic compounds becomes severe
Dong Si
55 ug/m3
OC51%
EC4%
SO415%
NO39%
Cl5%
Na2%
NH49% Other
5%
OC60%
EC3%
SO412%
NO36%
Cl3%
Na2%
NH46% Other
8%
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Days (left plot) and hours (right plot) of O3 concentrations exceeding air quality standard II in a year in Beijing during 1989-2000
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Observed maximum O3 concentrations in Beijing during 1989-2000
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Observed O3 mixing ratios in the summer of 2000
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National Air Quality Standards in ChinaNational Air Quality Standards in China
Pollutants Average First Class Second Class Third Class
SO2
Mg/m3
Yearly
Daily
Hourly
0.02
0.05
0.15
0.06
0.15
0.50
0.10
0.25
0.70
TSP
Mg/m3
Yearly
Daily
0.08
0.12
0.20
0.30
0.30
0.50
PM10
Mg/m3
Yearly
Daily
0.04
0.05
0.10
0.15
0.15
0.25
NO2
Mg/m3
Yearly
Daily
Hourly
0.04
0.08
0.12
0.08
0.12
0.24
0.08
0.12
0.24
CO
Mg/m3
Daily
Hourly
4.00
10.00
4.00
10.00
6.00
20.00
O3
Mg/m3
Hourly 0.16 0.20 0.20
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