The Level Of Haze And PM_2.5 In Zhengzhou And Heat Power Plants’ Atmospheric Environmental Impact Assessment

Zhengzhou is the capital of Henan province and the center of the central plains city group, which holds a pivotal status in the national economy development pattern, linking east with west and connecting south to north. Zhengzhou is one of the cities whose air pollution is quite serious on a national scale. The weather of dust-haze happens frequently. The condition impacts on people’s normal life and is harmful to human health. It allows no delay to discuss the cause of dust-haze and the temporal variations of PM2.5.This research concludes two parts. First, this study adopted the meteorological data monitored in Zhengzhou station (57083) published by National Oceanic and Atmospheric Administration to analyze the performance of the haze of Zhengzhou. The mass concentration of the atmospheric particulates (PM2.5, PM10) in industrial district of Zhengzhou was monitored by TEOM 1400a monitor and high volume sampler. Secondly, the research chooses AERMOD model to assess the impact of power plants’emission in Zhengzhou to the quality of the atmospheric environment. The improvements of different cutting measures on power plants source’s pollution are compared.Through the study, we can get the following conclusions:(1) The occurrence frequency of dust-haze in zhengzhou city is increasing roughly year by year. Especially in the 21st century, the number of days that the haze weather happened is up to 100 or more. Moderate to severe haze weather appeared. The number of days that severe haze happened is ranging from 1 to 3. Among the dust-haze weather,70% of which is slight haze. The incidence of haze weather is larger in autumn and winter, and which is smallest in summer. The rate of haze weather is high from October to the following year’s January. The concentration of PM2.5 is closely related with the occurrence of haze. When the concentration of PM2.5 is up to 150μg/m3, the severe weather haze is easy to occur.(2) The level of PM2.5 pollution exceeds bid badly. The average of concentrations of PM2.5 in 2010-2011 in industrial districts of Zhengzhou City is 76.1μg/m3. The number of days beyond the secondary standard accounts for 41.2%. The concentrations of the PM2.5 present obvious seasonal changes, and it is large in autumn and winter.(3) The source of Zhengzhou’s PM2.5 and PM10 has good consistency. In the 80% of the sample dates, the ratio of the PM2.5 and PM10 is between 60%～80%. The level of PM2.5 pollution is obviously the bi-modal distribution. It indicates that the traffic source influences largely.(4) If the Zhengzhou’s power plants deliver in in full load operation in the datum year, the concentration of NO2, PM2.5 in some of the largest daily may take place more than standard. Especially the concentration of NO2 distribution, the annual average concentration is badly exceeds. Some control measures must be adopted to reduce pollution and meet the purpose of no environmental damage.(5)In the same power load, the benefits of alternative energy and improving technology are is different. Using natural gas to replace coal burning is the optimal choice, and next is technology improvement. The worst is to reduce power plant’s load. Taking the measure of replacing part of coal by natural gas can significantly reduce the concentration of SO2 and NO2 in the atmospheric environment.