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From highly polluted inland city of China to "Lanzhou Blue": The air-pollution characteristics


Journal

Sciences in Cold and Arid Regions

Authors

Suping Zhao,Ye Yu,Dahe Qin

Year

2018

刊物类别

SCI

Volume

10

Issue

137-149

Pages

12-26

Corresponding Author

Zhao, SP

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zhaosp@lzb.ac.cn

Keywords

Lanzhou Blue; particulate matter; ozone pollution; temporal-spatial variation

Abstract

Air  quality was improved considerably and the so-called "Lanzhou Blue"  appeared frequently in Lanzhou due to implementation of some strict  emission-control measures in recent years. To better understand whether the  concentration of each air pollutant had decreased significantly and then give  some suggestions as to urban air-quality improvement in the near future, the  variations of the Air Quality Index(AQI) and six criterion air  pollutants(PM_(2.5), PM_(10), CO, SO_2, NO_2, and O_3) at five state-controlled  monitoring sites of Lanzhou were studied from 2013 to 2016. The AQI,  PM_(2.5), PM_(10), and SO_2 gradually decreased from 2013 to 2016, while CO  and NO_2 concentrations had slightly increasing trends, especially in urban  areas, due to the large number of motor vehicles, which had an annual growth  rate of 30.87%. The variations of the air pollutants in the  no-domestic-heating season were more significant than those in the  domestic-heating season. The increase of ozone concentration for the  domestic-heating season at a background station was the most significant  among the five monitoring sites. The vehicle-exhaust and ozone pollution was  increasingly severe with the rapid increase in the number of motor vehicles.  The particulate-matter pollution became slight in the formerly highly  polluted Lanzhou City. Some synergetic measures in urban and rural areas of  Lanzhou should be taken by the local government in the near future to control  fine particulate-matter(PM_(2.5)) and ozone pollution.