Abstract
Under the Air Pollution Prevention and Control Action Plan (APPCAP) implemented, China has witnessed an air quality change during the past five years, yet the main influence factors remain relatively unexplored. Taking the Beijing-Tianjin-Hebei (BTH) and Yangtze River Delta (YRD) regions as typical cluster cities, the Weather Research Forecasting (WRF) and Comprehensive Air Quality Model with Extension (CAMx) were introduced to demonstrate the meteorological and emission contribution and PM2.5 flux distribution. The results showed that the PM2.5 concentration in BTH and YRD significantly declined with a descend ratio of −39.6% and −28.1%, respectively. For the meteorological contribution, those regions had a similar tendency with unfavorable conditions in 2013–2015 (contribution concentration 1.6–3.8 μg/m3 and 1.1–3.6 μg/m3) and favorable in 2016 (contribution concentration −1.5 μg/m3 and −0.2 μg/m3). Further, the absolute value of the net flux’s intensity was positively correlated with the degree of the favorable/unfavorable weather conditions. When it came to emission intensity, the total net inflow flux increased, and the outflow flux decreased significantly across the border with the emission increasing. In short: the aforementioned results confirmed the effectiveness of the regional joint emission control and provided scientific support for the proposed effective joint control measures.
Highlights
During the past years, a severe widespread air pollution event with high concentrations of PM2.5 occurred in most cities’ development process such as Beijing-Tianjin-Hebei (BTH) and Yangtze River Delta (YRD) that gradually became the main economic entities attracting worldwide attention [1,2]
We investigated the impacts of local policies and the meteorological changes on PM2.5 abatements in the BTH and YRD regions during
The Weather Research Forecasting (WRF)-Comprehensive Air Quality Model with Extension (CAMx) modeling system was applied, and observed PM2.5 concentrations to quantify the contributions of the two factors
Summary
A severe widespread air pollution event with high concentrations of PM2.5 occurred in most cities’ development process such as Beijing-Tianjin-Hebei (BTH) and Yangtze River Delta (YRD) that gradually became the main economic entities attracting worldwide attention [1,2]. Take 2013 for example, the annual average PM2.5 concentrations in the BTH and YRD regions reached 105 and 68 μg/m3 , which were nearly 2–3 times higher than China’s National Ambient Air Quality Standard (NAAQS) of 35 μg/m3 [8,9]. The Chinese government established the Air Pollution Prevention and Control Action Plan (APPCAP) in September 2013 in order to mitigate the increasingly severe PM pollution in. Based on the guidance of the APPCAP, each typical city made further efforts to mitigate air pollution. After implementing a set of air pollution control policies, the average PM2.5 concentrations in BTH and YRD dropped to 65 and
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