Environmental Science and Pollution Research

, Volume 20, Issue 3, pp 1537–1545 | Cite as

Levels of black carbon and their relationship with particle number levels—observation at an urban roadside in Taipei City

  • Yu-Hsiang Cheng
  • Ben-Tzung Shiu
  • Meng-Hsien Lin
  • Jhih-Wei Yan
Research Article

Abstract

Information on the relationship between black carbon (BC) and particle number levels in urban areas is limited. Therefore, investigating the relationship between BC and particle number levels in different particle size ranges at an urban area is worthwhile. This study used an aethalometer and scanning mobility particle sizer to measure the levels of BC and particle number simultaneously at an urban roadside in Taipei City. Measurement results show that hourly BC levels are 0.62–8.80 μg m−3 (mean = 3.50 μg m−3) and hourly particle number levels are 4.21 × 103–4.64 × 104 particles cm−3 (mean = 2.00 × 104 particles cm−3) in Taipei urban area. The BC and particle number levels peak during morning (7:00–9:00) and evening (16:00–18:00) rush hours on weekdays. Low BC and particle number levels exist in the early morning hours. Time variations in BC levels are the same as those of particle number levels in this study, clearly indicating that BC and particles are likely released from the same emission source. Additionally, BC levels in the urban area are more strongly associated with ultrafine particle levels than with total particle number levels, particularly in the size range of 56–180 nm. According to measurement results, most BC in aerosols in urban areas can be in the ultrafine size range.

Keywords

Black carbon Ultrafine particle Particle number Urban area 

Notes

Acknowledgments

The authors would like to thank the National Science Council of the Republic of China, Taiwan, for financially supporting this research under Contract No. NSC100- 2221-E-131-001.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Yu-Hsiang Cheng
    • 1
  • Ben-Tzung Shiu
    • 1
  • Meng-Hsien Lin
    • 1
  • Jhih-Wei Yan
    • 1
  1. 1.Department of Safety, Health and Environmental EngineeringMing Chi University of TechnologyTaishanTaiwan

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