A new study has been conducted to understand whether the recent changes in China's air quality were driven by meteorological influences or air pollutant emission reduction efforts. It was led by Prof. Yinchang Feng from the College of Environmental Science and Engineering at Nankai University.
Over the past decade, substantial efforts have been made in China to curb air pollutant emissions. The implementation of two well-known and stricter nationwide Clean Air Actions—the"Air Pollution Prevention and Control Action Plan" from 2013 to 2017, and the"Three-Year Action Plan to Win the Battle for a Blue Sky" from 2018 to 2020—has played a pivotal role in this improvement.
China has witnessed a remarkable improvement in ambient air quality, as evidenced by the consistent decrease in the concentrations of major air pollutants and the number of hazy days. In addition to anthropogenic emissions,also regulate the variations of air pollution, especially in short-term timescale.
To accurately evaluate the effectiveness of emission reduction efforts, the researchers adjusted the air quality data across 31 major Chinese cities for meteorological influences, using an advanced machine learning based statistical model. After accounting for meteorological effects, the study confirms that the continuous decline in the annual average concentrations of major air pollutants in the selected 31 major Chinese cities during the 13th Five-Year Plan period was primarily attributable to the emission reduction programs, particularly the successful control of coal-related combustion emissions.reduction slowed down.
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