Ultrafine Particles on and near Roadways

Details

• Personal Author:
  Zhu Y
• Description:
  Ultrafine particle (UFP) refers to discrete particles with diameters Jess than 100 nm in ambient air that exist either as solid particles or liquid droplets. These particles originate from many different stationary and mobile sources as well as from photochemical production as a nucleation event, whereby new particles are formed in the atmosphere from gaseous precursors. The size, chemical compositions, and other physical and biological properties of UFPs are highly variable from place to place owing to the differences in the weather, seasonal patterns, and sources. UFP properties are also influenced by changes they undergo in the atmosphere. A complete description of the atmospheric UFPs would include an accounting of the chemical composition, morphology, and size of each particle and the relative abundance of each particle type as a function of particle size. However, the physical and chemical characteristics of particles are usually measured separately. Size distributions by particle number, used to calculate surface area and volume distributions, often are determined by physical means, such as electrical mobility of suspended UFPs. Chemical composition usually is determined by the analysis of collected samples although some species can be measured in situ. Although UFPs dominate the atmospheric particle number concentrations, they amount to a small contribution of atmospheric particle mass concentrations. A given mass of UFPs, however, has 100-1000 times more surface area than an equal mass of fine particles (0.1 um < diameter < 2.5 um) and approximately 105 times more surface area than an equal mass of coarse particles (2.5 um
• Subjects:
  Air Pollutants, Occupational Occupational Health Particulate Matter Safety
• Keywords:
  Airborne Particles Air Pollutants Automotive Emissions Environmental Health Particle Size Ultrafine Particles
• ISBN:
  9789814316828
• Publisher:
  Jenny Stanford Publishing
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Book
• Place as Subject:
  California ; OSHA Region 9
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  477-492
• NIOSHTIC Number:
  nn:20056139
• Citation:
  Nature's nanostructures. Barnard AS, Guo H eds. Singapore: Jenny Stanford Publishing, 2012 Jan; :477-492
• Contact Point Address:
  Yifang Zhu, Environmental Health Sciences Department, University of California, 650 Charles Young Drive South, Los Angeles, CA 90095 USA
• Email:
  yifang@ucla.edu
• Editor(s):
  Barnard AS; Guo H
• Federal Fiscal Year:
  2012
• Performing Organization:
  University of California Los Angeles
• Peer Reviewed:
  False
• Start Date:
  20050701
• Source Full Name:
  Nature's nanostructures
• End Date:
  20270630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:1e6e5c347036de109f21912cb9d6e6556d031335d2e058f35651f10a5f120d3f3ae206f660787d39d2388ce93e6f228e9176ed9bb9079883b7d417bf85e6a74b
• Download URL:
  https://stacks.cdc.gov/view/cdc/213802/cdc_213802_DS1.pdf
• File Type:
  [PDF - 8.16 MB ]