The coordinated control of PM_(2.5)and ozone has become the strategic goal of national air pollution control.Considering the gradual decline in PM_(2.5)concentration and the aggravation of ozone pollution,a better und...The coordinated control of PM_(2.5)and ozone has become the strategic goal of national air pollution control.Considering the gradual decline in PM_(2.5)concentration and the aggravation of ozone pollution,a better understanding of the coordinated control of PM_(2.5)and ozone is urgently needed.Here,we collected and sorted air pollutant data for 337 cities from 2015 to 2020 to explore the characteristics of PM_(2.5)and ozone pollution based on China’s five major air pollution regions.The results show that it is necessary to continue to strengthen the emission reduction in PM_(2.5)and ozone precursors,and control NO_(x) and VOCs while promoting a dramatic emission reduction in PM_(2.5).The primary method of curbing ozone pollution is to strengthen the emission control of VOCs,with a long-term strategy of achieving substantial emission reductions in NO_(x),because VOCs and NO_(x) are also precursors to PM_(2.5);hence,their reductions also contribute to the reduction in PM_(2.5).Therefore,the implementation of a multipollutant emission reduction control strategy aimed at the prevention and control of PM_(2.5)and ozone pollution is the only means to realize the coordinated control of PM_(2.5)and ozone.展开更多
To clarify the aerosol hygroscopic growth and optical properties of the Pearl River Delta(PRD)region,integrated observations were conducted in Heshan City of Guangdong Province from October 19 to November 17,2014.The ...To clarify the aerosol hygroscopic growth and optical properties of the Pearl River Delta(PRD)region,integrated observations were conducted in Heshan City of Guangdong Province from October 19 to November 17,2014.The concentrations and chemical compositions of PM2.5,aerosol optical properties and meteorological parameters were measured.The mean value of PM2.5 increased from less than 35(excellent)to 35-75μg/m^3(good)and then to greater than 75μg/m^3(pollution),corresponding to mean PM2.5 values of 24.9,51.2,and 93.3μg/m^3,respectively.The aerosol scattering hygroscopic growth factor(f(RH=80%))values were 2.0,2.12,and 2.18 for the excellent,good,and pollution levels,respectively.The atmospheric extinction coefficient(σext)and the absorption coefficient of aerosols(σap)increased,and the single scattering albedo(SSA)decreased from the excellent to the pollution levels.For different air mass sources,under excellent and good levels,the land air mass from northern Heshan had lower f(RH)andσsp values.In addition,the mixed aerosol from the sea and coastal cities had lower f(RH)and showed that the local sources of coastal cities have higher scattering characteristics in pollution periods.展开更多
The authors regret<In Abstract"The mean value of PM 2.5 increased from less than 35(excellent)to 35–75μg/m^(3)(good)and then to greater than 75μg/m^(3)(pollution),corresponding to mean PM 2.5 values of 24.9...The authors regret<In Abstract"The mean value of PM 2.5 increased from less than 35(excellent)to 35–75μg/m^(3)(good)and then to greater than 75μg/m^(3)(pollution),corresponding to mean PM 2.5 values of 24.9,51.2 and 93.3μg/m^(3),respectively.The aerosol scattering hygroscopic growth factor(f(RH=80%))values were 2.0,2.12 and 2.18 for the excellent,good and pollution levels,respectively."should be revised to"The mean value of PM 2.5(24-hr)increased from less than 35μg/m^(3)(excellent)to 35–75μg/m^(3)(good)and then to greater than 75μg/m^(3)(pollution),corresponding to mean PM 2.5 values of 24.9,51.2 and 93.3μg/m^(3),respectively.The aerosol scattering hygroscopic growth factor(f(RH=80%))values were 2.69,2.33 and 2.09 for the excellent,good and pollution levels,respectively."展开更多
基金supported by the National Natural Science Foundation of China(No.91844301)by the Beijing Municipal Natural Science Fund(No.JQ21030)。
文摘The coordinated control of PM_(2.5)and ozone has become the strategic goal of national air pollution control.Considering the gradual decline in PM_(2.5)concentration and the aggravation of ozone pollution,a better understanding of the coordinated control of PM_(2.5)and ozone is urgently needed.Here,we collected and sorted air pollutant data for 337 cities from 2015 to 2020 to explore the characteristics of PM_(2.5)and ozone pollution based on China’s five major air pollution regions.The results show that it is necessary to continue to strengthen the emission reduction in PM_(2.5)and ozone precursors,and control NO_(x) and VOCs while promoting a dramatic emission reduction in PM_(2.5).The primary method of curbing ozone pollution is to strengthen the emission control of VOCs,with a long-term strategy of achieving substantial emission reductions in NO_(x),because VOCs and NO_(x) are also precursors to PM_(2.5);hence,their reductions also contribute to the reduction in PM_(2.5).Therefore,the implementation of a multipollutant emission reduction control strategy aimed at the prevention and control of PM_(2.5)and ozone pollution is the only means to realize the coordinated control of PM_(2.5)and ozone.
基金supported by the National Natural Science Foundation of China(No.91544221)the People’s Republic of China Science and Technology Department(No.2016YFC0202004)
文摘To clarify the aerosol hygroscopic growth and optical properties of the Pearl River Delta(PRD)region,integrated observations were conducted in Heshan City of Guangdong Province from October 19 to November 17,2014.The concentrations and chemical compositions of PM2.5,aerosol optical properties and meteorological parameters were measured.The mean value of PM2.5 increased from less than 35(excellent)to 35-75μg/m^3(good)and then to greater than 75μg/m^3(pollution),corresponding to mean PM2.5 values of 24.9,51.2,and 93.3μg/m^3,respectively.The aerosol scattering hygroscopic growth factor(f(RH=80%))values were 2.0,2.12,and 2.18 for the excellent,good,and pollution levels,respectively.The atmospheric extinction coefficient(σext)and the absorption coefficient of aerosols(σap)increased,and the single scattering albedo(SSA)decreased from the excellent to the pollution levels.For different air mass sources,under excellent and good levels,the land air mass from northern Heshan had lower f(RH)andσsp values.In addition,the mixed aerosol from the sea and coastal cities had lower f(RH)and showed that the local sources of coastal cities have higher scattering characteristics in pollution periods.
文摘The authors regret<In Abstract"The mean value of PM 2.5 increased from less than 35(excellent)to 35–75μg/m^(3)(good)and then to greater than 75μg/m^(3)(pollution),corresponding to mean PM 2.5 values of 24.9,51.2 and 93.3μg/m^(3),respectively.The aerosol scattering hygroscopic growth factor(f(RH=80%))values were 2.0,2.12 and 2.18 for the excellent,good and pollution levels,respectively."should be revised to"The mean value of PM 2.5(24-hr)increased from less than 35μg/m^(3)(excellent)to 35–75μg/m^(3)(good)and then to greater than 75μg/m^(3)(pollution),corresponding to mean PM 2.5 values of 24.9,51.2 and 93.3μg/m^(3),respectively.The aerosol scattering hygroscopic growth factor(f(RH=80%))values were 2.69,2.33 and 2.09 for the excellent,good and pollution levels,respectively."
