Study offers verdict for China’s efforts on coal emissions

Researchers from China, France and the USA have evaluated China’s success in stemming emissions from its coal-fired power plants (CPPs).

China’s efforts on emission reductions, air quality improvement and human health protection were effective and similar measures could be used in countries such as India, to help them reduce emissions alongside rapid economic growth, the researcher suggests. (Image added by Asia Research News)

CPPs are one of the main contributors to air pollution in China, and their proliferation over the last 20 years has had significant impacts on air quality and public health.

These impacts led authorities to introduce measures to control emissions from CPPs and reduce their effects.

Writing today in Environmental Research Letters, researchers examined if these policies have been effective, and measured their benefits.

Dr Qiang Zhang, from Tsinghua University, China, is the study’s lead author. He said: “Between 2005 and 2015, the coal-fired power generation of CPPs in China grew by more than 97 percent. In 2010, CPPs’ sulphur dioxide, nitrogen oxide and fine particulate matter (PM2.5) emissions accounted for 33 per cent, 33 per cent and 6 percent of China’s total national emissions, respectively. The large amount of air pollutant emissions from CPPs causes fine particulate air pollution, which contributed 26 percent of the fine particulate nitrate and 22 percent of the fine particulate sulphate ambient concentration in 2012.

“To combat this, China introduced three primary policies for CPPs during 2005-2020. They aimed to improve efficiency energy by promoting large CPPs and decommissioning small plants during 2005-2020; brought in national emission cap requirements by installing of end-of-pipe control devices during 2005-2015; and introduced ultra-low emission standards between 2014-2020.”

To measure the effect these policies had on emissions, the team developed two retrospective emission scenarios based on a high-resolution coal-fired power plant database for China.

They also developed two emission prediction scenarios to forecast the CPPs’ emission changes associated with the implementation of ultra-low emission standards and power generation increments during 2015-2020.

Finally, they evaluated the air quality and health impacts associated with CPPs' emission changes during 2005-2020, using a regional air quality model and the integrated exposure-response model.

Dr Fei Liu, from the Universities Space Research Association, Goddard Earth Sciences Technology and Research, USA, is the study’s corresponding author. She said: “Our results show that overall, China’s efforts on emission reductions, air quality improvement and human health protection from CPPS between 2005-2020 were effective.

“We found that the upgrading of end-pipe control facilities could reduce PM2.5 exposures by 7.9 ug/m3 and avoid 111,900 premature deaths annually. Meanwhile, the early retirement of small and low-efficiency units could reduce PM2.5 exposures by 2.1 ug/m3 and avoid 31,400 annual premature deaths.

“This suggests similar measures could be taken in countries such as India, to enable the reduction of emissions alongside rapid economic development.”

ENDS

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Published: 12 Sep 2019

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The final version of ‘Air quality and health benefits of China’s emission control policies on coal-fired power plants during 2005-2020’ by RuiliWu et al (2019 Environ. Res. Lett.) will be freely available online from 00.00 BST on Friday September 13, 2019 at https://doi.org/10.1088/1748-9326/ab3bae