Recent studies of urban air pollution over the greater beijing area
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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. Basic Information.

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Recent Studies of Urban Air Pollution over the Greater Beijing Area

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Recent studies of urban air pollution over the greater beijing area

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


Basic information

Basic Information

  • 13.8 million residents in 16807 km2

  • 27 million tons of Coal / yr

  • 2 million tons of low S coal

  • 700 million m3 of natural gas

  • 1.849 million vehicles in Aug. 2002 (1.31million in 1998)

  • Sand storms in spring


Recent studies of urban air pollution over the greater beijing area

Heating season

Yearly average

No heating season

Spike: 1987,1992 and 1997

Emission control: 1998--

Yearly average concentrations of SO2 in the suburb of Beijing in the period of 1984-2000


Recent studies of urban air pollution over the greater beijing area

Daily average concentrations of SO2 in the suburb of Beijing in the period of 1997.01-2001.02

1. Seasonal variation

2. Effect of SO2 emission control


Recent studies of urban air pollution over the greater beijing area

Heating season

Yearly average

No heating season

Fast increase after 1989

Emission control: 1998-

Yearly average concentrations of NOx in the suburb of Beijing in the period of 1981-2000


Recent studies of urban air pollution over the greater beijing area

Daily average concentrations of NOx in the suburb of Beijing in the year of 2001

NO2/NOx ~ 1


Recent studies of urban air pollution over the greater beijing area

Yearly average

Heating season

No heating season

Yearly average concentrations of TSP in the suburb of Beijing in the period of 1981-2000


Recent studies of urban air pollution over the greater beijing area

Daily average concentrations of TSP in the suburb of Beijing in the period of 1997.01-2001.06 (unit: mg/m3)


Recent studies of urban air pollution over the greater beijing area

Chemical composition of TSP sampled in a park in Beijing during the period from June 23 to July 3 of 2000


Recent studies of urban air pollution over the greater beijing area

Daily average concentrations of PM10 in the suburb of Beijing in the period of 1999.01-2001.06 (unit: mg/m3)


Recent studies of urban air pollution over the greater beijing area

PM10/TSP is higher in the period of May ~ October than in other time

Daily average concentrations of TSP and PM10 and their ratios in the suburb of Beijing in the period of 1999.01-2001.06


Recent studies of urban air pollution over the greater beijing area

The ratios of SO42-, NO3-,NH4+,OC and EC > 0.5

Ca, Al and Fe < 0.5

The ratios of chemical composition in PM2.5 and PM10 in Beijing in 2000


Recent studies of urban air pollution over the greater beijing area

Chemical compositions of PM2.5 in the winter and summer of Beijing

1999, 6, 13-14

118.19 ug/m3

Pollution caused by organic compounds becomes severe


Recent studies of urban air pollution over the greater beijing area

PM2.5 and its chemical compositions Dongsi and PKU sites, January 20, 2000

Dong Si

55 ug/m3

Peking Univ.

66 ug/m3

Pollution caused by organic compounds becomes severe


Recent studies of urban air pollution over the greater beijing area

Days (left plot) and hours (right plot) of O3 concentrations exceeding air quality standard II in a year in Beijing during 1989-2000


Recent studies of urban air pollution over the greater beijing area

Observed maximum O3 concentrations in Beijing during 1989-2000


Recent studies of urban air pollution over the greater beijing area

Observed O3 mixing ratios in the summer of 2000


Recent studies of urban air pollution over the greater beijing area

National Air Quality Standards in China


Recent studies of urban air pollution over the greater beijing area

Thank you!


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