Abstract
This paper reveals a study on air pollution process over North China, applying remote sensing technology, using satellite observation and in situ measurements during the twenty-first Asia-Pacific Economic Cooperation (APEC) meeting, which was held in Beijing between 6 and 12 November when the clear weather was called “APEC-Blue”. In the meantime, pollutants concentrations including PM2.5 and PM10 in Beijing were lower than 100 μg/m3 owing to the effective government measures and policies, as well as meteorological conditions. High aerosol loading (AOD > 1) was observed over south of Beijing and vertical observations showed that the pollutants were prominent near the land surface. Different from the meeting period, high pollutants concentrations with explosive growth (the values of PM2.5 and PM10 peaking at 291 μg/m3 and 360 μg/m3 respectively) appeared over Beijing after the meeting period, accompanied by strong temperature inversion and high Relative Humidity (RH) values. The pollution particles transferred from Beijing area to south part of North China. Otherwise, fine-mode particles with strong absorption characteristic (UVAI > 1.5, AOD > 1) covered the Beijing sky in the meantime, indicating the existence of black carbon aerosols.
Highlights
China has made an extremely rapid economic growth in recent decades, which has led to an increase of resource consumption, environment deterioration and relevant health problems
Between 6 and 12 November, the twenty-first Asia-Pacific Economic Cooperation (APEC) convention was held in Beijing
We analyzed the evolution of haze pollution in Beijing around the APEC conference period with the purpose of expound the formation mechanism with combined satellite data, meteorological conditions and surface observations
Summary
China has made an extremely rapid economic growth in recent decades, which has led to an increase of resource consumption, environment deterioration and relevant health problems. Many fearful atmosphere pollution problems have been caused by the dramatic growth of anthropogenic emissions during the last decades in China [1,2]. Dust particles or moist air masses blended with anthropogenic pollutants wandered over North China, aggravating to the serious weather and leading to widely distributed haze pollution [7]. Ground-based observations describe the concentrations and temporal variations of several emission pollutants in different megacities. During the APEC summit periods, different types of haze events with different aerosol optical properties occurred over North China, leading to a wide range of pollution. There are many effective remote sensing data to monitor aerosol properties such as ground-based observation, satellite images, etc. They have some inevitable inadequacies relative to each other. The different aerosol properties and meteorological conditions were discussed in detail
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