摘要：During the World Exposition 2010 (Expo, from May to October), emission control
measures were implemented in Shanghai and surrounding areas to improve the
air quality. To evaluate the effect of these measures, we use the tropospheric
NO2 column, aerosol optical thickness (AOT) and CO concentration observations
from the satellite instruments GOME-2, MODIS and MOPITT, respectively.
The analysis shows about 8% and 14% reductions of tropospheric
NO2 columns and AOT respectively over Shanghai during the Expo period, compared to the past three
years. A 12% reduction of CO concentration at 700 hPa over Shanghai and surrounding areas is
found during the Expo period. On the other hand, the satellite measurements show increases of
NO2 by 20% and AOT by 23% over Shanghai urban areas after the Expo (November 2010–April
2011), when the short-term emission control measures were lifted. Our study indicates that
the air quality measures were effective in Shanghai and surrounding provinces during the
Expo period.
