Characteristics and Receptor Modeling of Atmospheric PM2.5 at Urban and Rural Sites in Pingtung, Taiwan

Suspended particles of PM2.5 in air were sampled concurrently at an urban site and a rural site in Pingtung County in southern Taiwan, in the spring, the summer and the fall of 2005. All samples were analyzed to identify eight water-soluble ions, carbonaceous contents, and 19 metal elements. Measurements reveal that the overall means of PM10 (and PM2.5) are 59.2 (47.4) μg/m^3 at Pingtung (urban) site, and 63.6 (45.7) μg/m^3 at Chao-Chou (rural) site. Although both sites exhibited strong correlations (R = 0.98 at Pingtung, and R=0.78 at Chao-Chou) between PM10 and PM2.5 masses, the mean PM2.5/PM10 ratio was 0.81 at Pingtung, higher than 0.68 at Chao-Chou, suggesting that relatively large bare lands and outdoor burning on farms may have caused more coarse particles to be present in PM2.5 at a rural site (Chao-Chou) than at an urban site (Pingtung). Results of CMB (chemical mass balance) modeling show that the main contributors to PM2.5 mass at Pingtung are vehicle exhaust (49.3-62.4%) and secondary aerosols (SO4(superscript 2-), NO3(superscript –) and NH4(superscript +) (31.2-37.8%), while those at Chao-Chou are the outdoor burning (25.3-50.4%) of agricultural waste, secondary aerosols (27.2-34.3%) and vehicle exhaust (12.0-26.9%), depending on the seasons.

[1]  Hélène Cachier,et al.  Determination of atmospheric soot carbon with a simple thermal method , 1989 .

[2]  P. Mulawa,et al.  Atmospheric Carbonaceous Species Measurement Methods Comparison Study: General Motors Results , 1990 .

[3]  D Bellinger,et al.  The long-term effects of exposure to low doses of lead in childhood. An 11-year follow-up report. , 1990, The New England journal of medicine.

[4]  E. Silbergeld,et al.  The long-term effects of exposure to low doses of lead in childhood. , 2010, The New England journal of medicine.

[5]  R. Hillamo,et al.  Size distributions of atmospheric trace elements at dye 3, Greenland — I. Distribution characteristics and dry deposition velocities , 1993 .

[6]  J C Chow,et al.  Validation of the chemical mass balance receptor model applied to hydrocarbon source apportionment in the southern california air quality study. , 1994, Environmental science & technology.

[7]  Children and environmental toxins. , 1995 .

[8]  B. Weiss,et al.  Association of particulate air pollution and acute mortality: involvement of ultrafine particles? , 1995, Inhalation toxicology.

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

[10]  P. Koutrakis,et al.  Spatial variation in particulate concentrations within metropolitan Philadelphia , 1996 .

[11]  Roy M. Harrison,et al.  Sources and processes affecting concentrations of PM10 and PM2.5 particulate matter in Birmingham (U.K.) , 1997 .

[12]  J. Seinfeld,et al.  Atmospheric Chemistry and Physics: From Air Pollution to Climate Change , 1997 .

[13]  Donald Dabdub,et al.  Chemical Coupling Between Atmospheric Ozone and Particulate Matter , 1997 .

[14]  Spatial and temporal variations of particulate precursor gases and photochemical reaction products during sjvaqs/auspex ozone episodes , 1998 .

[15]  U. Baltensperger,et al.  Elemental carbon (EC) and black carbon (BC) measurements with a thermal method and an aethalometer at the high-alpine research station Jungfraujoch , 1999 .

[16]  J. Chow,et al.  Temporal Variations of PM2.5, PM10, and Gaseous Precursors during the 1995 Integrated Monitoring Study in Central California. , 1999, Journal of the Air & Waste Management Association.

[17]  J. Schwartz,et al.  Assessing confounding, effect modification, and thresholds in the association between ambient particles and daily deaths. , 2000, Environmental health perspectives.

[18]  P. Koutrakis,et al.  Concentration and Composition of Atmospheric Aerosols from the 1995 SEAVS Experiment and a Review of the Closure between Chemical and Gravimetric Measurements , 2000, Journal of the Air & Waste Management Association.

[19]  K S Chen,et al.  Determination of Source Contributions to Ambient PM2.5 in Kaohsiung, Taiwan, Using a Receptor Model , 2001, Journal of the Air & Waste Management Association.

[20]  Roy M. Harrison,et al.  Size distributions of trace metals in atmospheric aerosols in the United Kingdom , 2001 .

[21]  Comparison of Fine Particles and the Relationship between Particle Variations and Meteorology at an Urban Site and a Remote Site in the Eastern United States , 2002, Journal of the Air & Waste Management Association.

[22]  J. Lin.  Characterization of water-soluble ion species in urban ambient particles. , 2002, Environment international.

[23]  P. Fu,et al.  Characterization of particulate, metallic elements of TSP, PM(2.5) and PM(2.5-10) aerosols at a farm sampling site in Taiwan, Taichung. , 2003, The Science of the total environment.

[24]  Robert Gehrig,et al.  Characterising seasonal variations and spatial distribution of ambient PM10 and PM2.5 concentrations based on long-term Swiss monitoring data , 2003 .

[25]  C. Lai,et al.  Photochemical modeling and analysis of meteorological parameters during ozone episodes in Kaohsiung, Taiwan , 2003 .

[26]  J. Chow,et al.  Characterization of chemical species in PM2.5 and PM10 aerosols in Hong kong , 2003 .

[27]  Shixiang Gao,et al.  Chemical characterization of water-soluble components of PM10 and PM2.5 atmospheric aerosols in five locations of Nanjing, China , 2003 .

[28]  C. Lai,et al.  Trends in Concentration of Ground-Level Ozone and Meteorological Conditions during High Ozone Episodes in the Kao-Ping Airshed, Taiwan , 2004, Journal of the Air & Waste Management Association.

[29]  Zifa Wang,et al.  The air-borne particulate pollution in Beijing—concentration, composition, distribution and sources , 2004 .

[30]  Source apportionment to PM10 in different air quality conditions for Taichung urban and coastal areas, Taiwan , 2004 .

[31]  Martin Gysel,et al.  Chemical characterisation of PM2.5, PM10 and coarse particles at urban, near-city and rural sites in Switzerland , 2005 .

[32]  J. Sarnat,et al.  Analysis of PM10, PM2.5, and PM2.5–10Concentrations in Santiago, Chile, from 1989 to 2001 , 2005, Journal of the Air & Waste Management Association.