How have the characteristics of air quality in a typical large Chinese city changed between 2011 and 2017?
Great efforts have been made to control air pollution in China, and these have markedly changed air quality. Here, a detailed analysis of changes in air pollution in Nanjingbetween 2011 and 2017 based on hourly concentration measurements of six air pollutants is presented. The concentrations of most of these pollutants have decreased since 2013. This has resulted in the annual proportion of days meeting the new Chinese air quality standards increasing by 17.5%, as well as the proportion of days of severe or strong pollution decreasing by 8.0%. However, the ozone (O3) concentration increased between 2011 and 2017, and the number of days that O3 concentrations exceeded the Chinese standard dramatically increased from 8 days in 2011 to 60 days in 2017. Clearly, O3 has replaced fine particulate matter (PM2.5) as the most frequent dominant pollutant since 2016. Our results indicate that air pollution in Nanjing has evolved from being dominated by primary pollutants to being dominated by secondary pollutants, reflecting interaction of multiple emissions and chemical processes. Current policies and strategies need to be reassessed and modified to deal with interactions between emissions from different sources under variable meteorological conditions.
KeywordsAir quality Evolution characteristics Primary pollutants Secondary pollutants Ozone
We thank Dr. Trudi Semeniuk from Liwen Bianji, Edanz Editing China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
This work was supported by the National Key Research and Development Program of China (2016YFC0208504), and the National Key Basic Research Program of China (2014CB441203).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Li GH, Bei N, Cao J, Wu J, Long X, Feng T, Dai W, Liu S, Zhang Q, Tie X (2017) Widespread and persistent ozone pollution in eastern China during the non-winter season of 2015: observations and source attributions. Atmos Chem Phys 17:2759–2774. https://doi.org/10.5194/acp-17-2759-2017 CrossRefGoogle Scholar
- Luo XS et al (2017) Effects of emission control and meteorological parameters on urban air quality showed by the 2014 Youth Olympic Games in China. Fresenius Environ Bull 26:4798–4807Google Scholar
- Manju A, Kalaiselvi K, Dhananjayan V, Palanivel M, Banupriya GS, Vidhya MH, Panjakumar K, Ravichandran B (2018) Spatio-seasonal variation in ambient air pollutants and influence of meteorological factors in Coimbatore, southern India. Air Qual Atmos Health 11:1179–1189. https://doi.org/10.1007/s11869-018-0617-x CrossRefGoogle Scholar
- Ministry of Ecological Environment (2011) Technical guideline on environmental monitoring quality management vol HJ 630-2011. Ministry of Ecological Environment of the People’s Republic of China. http://kjs.mee.gov.cn/hjbhbz/bzwb/other/qt/201109/W020120130585014685198.pdf. Accessed 28 Dec 2018
- Ministry of Ecological Environment (2012a) Ambient air quality standard vol GB3095-2012. Ministry of Ecological Environment of the People’s Republic of China. http://kjs.mee.gov.cn/hjbhbz/bzwb/dqhjbh/dqhjzlbz/201203/W020120410330232398521.pdf. Accessed 28 Dec 2018
- Ministry of Ecological Environment (2012b) Technical regulation on ambient air quality index (on trial) vol HJ 633—2012. Ministry of Ecological Environment of the People’s Republic of China. http://kjs.mee.gov.cn/hjbhbz/bzwb/jcffbz/201203/W020120410332725219541.pdf. Accessed 28 Dec 2018
- Ministry of Ecological Environment (2013) Technical regulation for ambient air quality assessment (on trial) vol HJ 663—2013. Ministry of Ecological Environment of the People’s Republic of China. http://kjs.mee.gov.cn/hjbhbz/bzwb/jcffbz/201309/W020131105548549111863.pdf. Accessed 28 Dec 2018
- Ministry of Ecological Environment (2018) Ecological environment bulletin of China. Ministry of Ecological Environment of the People’s Republic of China. http://www.mee.gov.cn/hjzl/zghjzkgb/lnzghjzkgb/201805/P020180531534645032372.pdf. Accessed 28 Dec 2018
- Nanjing Statistics Bureau (2012) Statistical Yearbook of Nanjing 2011. In. Phoenix Publishing House, Nanjing, China. ISBN: 7550608288Google Scholar
- Nanjing Statistics Bureau (2018) Statistical Yearbook of Nanjing 2017. In. China Statistics Press, Beijing, China. ISBN: 978-7-5037-8532-0Google Scholar
- National Bureau of Statistics of China (2012) China Statical Yearbook 2011. In. China Statistics Press, Beijing, China. ISBN: 978-7-5037-6351-9Google Scholar
- National Bureau of Statistics of China (2014) China Statical Yearbook 2013. In. China Statistics Press, Beijing, China. ISBN: 978-7-5037-7280-1Google Scholar
- National Bureau of Statistics of China (2017) National Data, http://data.stats.gov.cn/easyquery.htm?cn=C01. Accessed 28 Dec 2018
- National Bureau of Statistics of China (2018) China Statical Yearbook 2017. In. China Statistics Press, Beijing, China, ISBN: 978-7-8946-8732-6Google Scholar
- State Council (2013) Air pollution prevention and control action plan. State Council. http://zfs.mee.gov.cn/hjjj/gjfbdjjzcx/hjczzc/201501/t20150129_295223.shtml. Accessed 28 Dec 2018
- Zhang QF, Robert C (2012) Toward an environmentally sustainable future: country environmental analysis of the People’s Republic of China. China Financial & Economical Publishing House, Beijing, China. ISBN: 978-7-5095-4085-5Google Scholar
- Zhao H, Wang S, Wang W, Liu R, Zhou B (2015) Investigation of ground-level ozone and high-pollution episodes in a megacity of eastern China. PLoS One 10. https://doi.org/10.1371/journal.pone.0131878
- Zhao SP, Yu Y, Yin DY, He JJ, Liu N, Qu JJ, Xiao JH (2016) Annual and diurnal variations of gaseous and particulate pollutants in 31 provincial capital cities based on in situ air quality monitoring data from China National Environmental Monitoring Center. Environ Int 86:92–106. https://doi.org/10.1016/j.envint2015.11.003 CrossRefGoogle Scholar
- Zheng B, Tong D, Li M, Liu F, Hong C, Geng G, Li H, Li X, Peng L, Qi J, Yan L, Zhang Y, Zhao H, Zheng Y, He K, Zhang Q (2018) Trends in China’s anthropogenic emissions since 2010 as the consequence of clean air actions. Atmos Chem Phys 18:14095–14111. https://doi.org/10.5194/acp-18-14095-2018 CrossRefGoogle Scholar