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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

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 Beijing Area

  • 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


Heating season Beijing Area

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


Daily average concentrations of SO Beijing Area2 in the suburb of Beijing in the period of 1997.01-2001.02

1. Seasonal variation

2. Effect of SO2 emission control


Heating season Beijing Area

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


Daily average concentrations of NO Beijing Areax in the suburb of Beijing in the year of 2001

NO2/NOx ~ 1


Yearly average Beijing Area

Heating season

No heating season

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


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


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


Daily average concentrations of PM during the period from June 23 to July 3 of 2000 10 in the suburb of Beijing in the period of 1999.01-2001.06 (unit: mg/m3)


PM during the period from June 23 to July 3 of 2000 10/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


The ratios of SO during the period from June 23 to July 3 of 2000 42-, 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


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


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

Dong Si

55 ug/m3

Peking Univ.

66 ug/m3

Pollution caused by organic compounds becomes severe


Days (left plot) and hours (right plot) of O Beijing3 concentrations exceeding air quality standard II in a year in Beijing during 1989-2000


Observed maximum O Beijing3 concentrations in Beijing during 1989-2000




Thank you! Beijing


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