- 期刊
- OpenAccess
A Study of Characteristics and Origins of Haze Pollution in Zhengzhou, China, Based on Observations and Hybrid Receptor Models
摘要
To obtain a comprehensive picture of characteristics and sources of haze pollution in Zhengzhou, we analyzed annual air pollutant (fine particulate matter (PM_(2.5)), inhalable particulate matter (PM_(10)), carbon monoxide (CO), nitrogen dioxide (NO_2), sulfur dioxide (SO_2) and ozone (O_3)) observations at nine monitoring stations from March 1, 2013 to February 28, 2014. A case study on haze pollution was carried out using observations, metrological data, aerosol optical depth (AOD) values and Hybrid receptor models. Results of annual variations of air pollutants indicated that PM_(2.5) pollution in Zhengzhou was the most severe. Monthly variations revealed that all air pollutants except O_3 showed peak values in December because of the increased local emissions during heating, while the lowest value found in August was probably because of the favorable dispersion conditions. The monthly variation patterns of O_3 concentrations show the peak values in August due to higher temperature and stronger solar radiation. The diurnal variations showed that PM_(2.5) concentration variations were consistent with the traffic flow. The high values of PM_(2.5)/PM_(10) and PM_(2.5)/CO occurred in the afternoon probably due to the strong photochemical reactions. Results of the case study showed that relative humidity and wind speed were the main meteorological factors influencing PM_(2.5) concentrations. Back trajectories show that regional transport from the northeast and southeast of Zhengzhou (such as Puyang, Kaifeng, Zhoukou, and Xuchang in Henan province) also made a big contribution to the PM_(2.5) pollution in Zhengzhou. Our results demonstrated that the spatialtemporal distributions of PM_(2.5) in Zhengzhou were determined by complex factors such as primary emissions, secondary production, meteorological conditions and local/regional-transport.
延伸閱讀
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