Increasing air pollution, particularly in terms of fine particulate matter (PM2.5) and ozone (O3), caused by large-scale fossil fuel combustion, affects human health and economic activities in China. In this study, we analyzed the spatiotemporal trends of carbon emissions, carbon emission intensity, and concentrations of PM2.5 and O3 in 30 provincial-level administrative regions of China during 2010–2019. Overall, an increasing trend was observed in carbon emissions, with high emissions occurring in Shandong, Hebei, and Jiangsu in particular. The highest growth rates of carbon emissions were 169% and 117% in Xinjiang and Ningxia, respectively. Conversely, the carbon emission intensities and concentrations of PM2.5 and O3 decreased across the study regions at different rates. The western and central regions experienced the greatest decrease in carbon emissions in 2019 compared with that of 2010, followed by those in the northeastern and eastern regions. Spatiotemporal variations suggest that pollution control is essential for improving air quality and offsetting the negative impact of increased energy consumption. Overall, this study shows that pollution control policies lead to short-term improvements in air quality, and hence that the implementation of stringent environmental protection policies is essential.

This study uses online monitoring data from the Hubei Environmental Monitoring Center’s Atmospheric Compound Pollution Automatic Monitoring Station from 2016 to 2019 to analyze the diurnal changes in the concentration of water-soluble ions in particulate matter in Wuhan. During the study period, the concentrations of SO2, NO3−, and SO42− changed significantly, while those of NH4+, NH3, and Ca2+ exhibited minimal differences. SO2 and NO3− showed an annually increasing trend, while NH4+ and SO42− exhibited an annually decreasing trend. The ion concentration was generally higher in the winter and spring and lower in the summer and autumn. The concentration of water-soluble ions was generally higher during the day than at night. However, the “weekend effect” on the change in ion concentrations was substantial and higher during the day than at night. This effect was the strongest for NO3− and the weakest for NH3. These changes in the weekend effect of water-soluble ions in particulate matter clearly revealed the impact of periodic human activities on atmospheric pollution. Taken together, the results of this novel study reveal the diurnal pollution characteristics and “weekend effect” of water-soluble ions with high concentrations in atmospheric aerosols in Wuhan over a four-year period, thus providing relevant insights for Wuhan’s atmospheric mitigation plan.

No abstract

No abstract

To date, research regarding the changes of the sulfur and nitrogen rates in Wuhan during the summer is limited. In this study, we analyzed the air quality in Wuhan, China, using water-soluble ion, gaseous precursor, and weather data. A Spearman correlation analysis was then performed to investigate the temporal changes in air quality characteristics and their driving factors to provide a reference for air pollution control in Wuhan. The results indicate that SO2 in the atmosphere at Wuhan undergoes secondary conversion and photo-oxidation, and the conversion degree of SO2 is higher than that of NO2. During the summers of 2016 and 2017, secondary inorganic atmospheric pollution was more severe than during other years. The fewest oxidation days occurred in summer 2020 (11 days), followed by the summers of 2017 and 2014 (25 and 27 days, respectively). During the study period, ion neutralization was the strongest in summer 2015 and the weakest in August 2020. The aerosols in Wuhan were mostly acidic and NH4+ was an important neutralizing component. The neutralization factors of all cations showed little change in 2015. K+, Mg2+, and Ca2+ level changes were the highest in 2017 and 2020. At low temperature, high humidity, and low wind speed conditions, SO2 and NO2 were more easily converted into SO42− and NO3−.