Abstract
The annual tendency, monthly and seasonal distribution of main air pollutants SO 2 , NO 2 and PM 10 and the characteristics of atmospheric pollution in Lanzhou have been analyzed based on the atmospheric monitoring data from 2001 to 2009. The results indicate that Lanzhou is one of the most heavily polluted cities in China, which have more heavy pollution weather number and less fine weather compared with other large cities in China. During the last nine years, there have been remarkable decrease in PM 10 and SO 2 , and a slight increase in NO 2 mass concentrations. However, the concentrations of the three pollutants were relatively high. PM 10 was the dominant pollutants while the mass concentration of SO 2 and NO 2 were relatively low. The pollution of PM 10 , SO 2 and NO 2 presented obvious seasonal change: air pollution was severer in winter and milder in summer. PM 10 exceeded the second level of the national ambient air quality standard (NAAQS) all the years, the SO 2 exceeded the standard in part years, and the concentration of NO 2 no exceeded the standard, so they showed a coal smoke pollution typically. The meteorological conditions had a vital influence on the concentration of pollutants. A comparison of the mass concentrations of the three pollutants under different meteorological conditions has revealed that a negative correlation existed between the concentrations of pollutants and wind speed. Precipitation had important cleanup effect on pollutants. A negative correlation also existed between the visibility and the three pollutants.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call