Concentrations, correlations and chemical species of PM2.5/PM10 based on published data in China: Potential implications for the revised particulate standard.

Particulate matter (PM) has been of great concern in China due to the increasing haze pollution in recent years. In 2012, the Chinese national ambient air quality standard (NAAQS) was amended with a "more strict" regulation on the PM concentrations, i.e., 35 and 70 µg/m(3) for annual PM2.5 and PM10 averages, respectively (Grade-Ⅱ, GB3095-2012). To evaluate the potential of China to attain such new NAAQS and provide a more generalized chemical profile of PM in China, a comprehensive statistical analysis was carried out based on the published data of parallel PM2.5 and PM10 mass concentrations and chemical compositions of PM2.5 and PM10. The results show that most of the measured concentrations far exceed the new NAAQS. PM2.5 and PM10 show a strong positive correlation (R(2) = 0.87, p < 0.01) with PM2.5 accounting for about 65% of PM10, suggesting that the abatement of PM2.5 is crucial for reducing PM pollution and hence improving air quality in China. Organic carbon (OC), sulfate and crustal species are the three major components of PM. The NO3(-)/SO4(2-) ratios are 0.43 ± 0.26 in PM2.5 and 0.56 ± 0.29 in PM10, and the OC/EC ratios are 3.63 ± 1.73 in PM2.5 and 4.17 ± 2.09 in PM10, signifying that the stationary emissions from coal combustion remain the main PM source. An evaluation of PM2.5 situation in current China was carried out and the results show that it would take about 27 years to meet the limit value of 35 µg/m(3) in the revised standard, implying a rigorous challenge in PM2.5 control in China in the future.

[1]  B. Turpin,et al.  Origins of primary and secondary organic aerosol in Atlanta: results of time-resolved measurements during the Atlanta Supersite Experiment. , 2002, Environmental science & technology.

[2]  Qiang Yao,et al.  Studies on formation and control of combustion particulate matter in China: A review , 2009 .

[3]  J. Chow,et al.  Seasonal variations and sources of mass and chemical composition for PM10 aerosol in Hangzhou, China , 2009 .

[4]  Ren Zhen-hai Several Characteristics of Atmospheric Environmental Quality in China at Present , 2004 .

[5]  Xuehua Zhou,et al.  Carbonaceous aerosols over China—review of observations, emissions, and climate forcing , 2015, Environmental Science and Pollution Research.

[6]  Hui Yuan,et al.  Long-term monitoring and source apportionment of PM2.5/PM10 in Beijing, China. , 2008, Journal of environmental sciences.

[7]  Zhiliang Yao,et al.  Gaseous and particulate emissions from rural vehicles in China , 2011 .

[8]  Ying Wang,et al.  The ion chemistry and the source of PM2.5 aerosol in Beijing , 2005 .

[9]  J. Fung,et al.  Application of positive matrix factorization in estimating aerosol secondary organic carbon in Hong Kong and insights into the formation mechanisms , 2005 .

[10]  Kan Huang,et al.  Characteristics and sources of air-borne particulate in Urumqi, China, the upstream area of Asia dust , 2008 .

[11]  C. Chan,et al.  Properties of organic matter in PM2.5 at Changdao Island, China - A rural site in the transport path of the Asian continental outflow , 2007 .

[12]  Xiaoye Zhang,et al.  Carbonaceous aerosol composition over various regions of China during 2006 , 2008 .

[13]  B. Heikes,et al.  Chemical mechanisms of acid generation in the troposphere , 1985, Nature.

[14]  Ming Fang,et al.  Managing air quality in a rapidly developing nation : China , 2009 .

[15]  Jiamo Fu,et al.  Chemical Composition and Sources of PM10 and PM2.5 Aerosols in Guangzhou, China , 2006, Environmental monitoring and assessment.

[16]  J. Prospero,et al.  Relationships among aerosol constituents from Asia and the North Pacific during PEM-West A , 1996 .

[17]  Judith C. Chow,et al.  Descriptive analysis of PM2.5 and PM10 at regionally representative locations during SJVAQS/AUSPEX , 1996 .

[18]  Kebin He,et al.  The water-soluble ionic composition of PM2.5 in Shanghai and Beijing, China , 2002 .

[19]  Jiming Hao,et al.  Improving Urban Air Quality in China: Beijing Case Study , 2005, Journal of the Air & Waste Management Association.

[20]  Y. Q. Wang,et al.  Spatial distribution and interannual variation of surface PM 10 concentrations over eighty-six Chinese cities , 2010 .

[21]  C. Chan,et al.  Air pollution in mega cities in China , 2008 .

[22]  Tao Wang,et al.  Emission characteristics of CO, NOx, SO2 and indications of biomass burning observed at a rural site in eastern China , 2002 .

[23]  V. Mohnen,et al.  The availability of H2O2 and O3 for aqueous phase oxidation of SO2. The question of linearity. , 1990 .

[24]  Thomas A. Cahill,et al.  Composition of PM2.5 and PM10 Aerosols in the IMPROVE Network , 1997 .

[25]  K. He,et al.  Characteristics of PM 2.5 speciation in representative megacities and across China , 2011 .

[26]  Barbara J. Turpin,et al.  An in situ, time-resolved analyzer for aerosol organic and elemental carbon , 1990 .

[27]  G. Carmichael,et al.  Asian emissions in 2006 for the NASA INTEX-B mission , 2009 .

[28]  G. Oberdörster,et al.  Nanotoxicology: An Emerging Discipline Evolving from Studies of Ultrafine Particles , 2005, Environmental health perspectives.

[29]  Jing Chen,et al.  A study of air pollution of city clusters , 2011 .

[30]  J. Huntzicker,et al.  Secondary formation of organic aerosol in the Los Angeles basin: A descriptive analysis of organic and elemental carbon concentrations , 1991 .

[31]  S. Friedlander,et al.  A Comparative Study of Chemical Databases for Fine Particle Chinese Aerosols , 2000 .

[32]  Judith C. Chow,et al.  Spatial and seasonal distributions of carbonaceous aerosols over China , 2007 .

[33]  Jianfeng Li,et al.  A high-resolution emission inventory of crop burning in fields in China based on MODIS Thermal Anomalies/Fire products , 2012 .

[34]  J. Fung,et al.  Application of positive matrix factorization in estimating aerosol secondary organic carbon in Hong Kong and its relationship with secondary sulfate , 2006 .

[35]  Y. Q. Wang,et al.  Atmospheric aerosol compositions in China: Spatial/temporal variability, chemical signature, regional haze distribution and comparisons with global aerosols , 2011 .

[36]  H. Hansson,et al.  Speciation and origin of PM10 and PM2.5 in selected European cities , 2004 .

[37]  Bert Brunekreef,et al.  Chemical composition and mass closure of particulate matter at six urban sites in Europe , 2006 .

[38]  J. Chow,et al.  PM2.5 chemical source profiles for vehicle exhaust, vegetative burning, geological material, and coal burning in Northwestern Colorado during 1995. , 2001, Chemosphere.