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On-bicycle exposure to particulate air pollution: Particle number, black carbon, PM2.5, and particle size

Hankey, Steve ; Marshall, Julian D

Atmospheric Environment, December 2015, Vol.122, pp.65-73 [Periódico revisado por pares]

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  • Título:
    On-bicycle exposure to particulate air pollution: Particle number, black carbon, PM2.5, and particle size
  • Autor: Hankey, Steve ; Marshall, Julian D
  • Assuntos: Traffic-Related Air Pollution ; Active Travel ; Traffic Mix ; Non-Motorized Travel ; Engineering ; Environmental Sciences
  • É parte de: Atmospheric Environment, December 2015, Vol.122, pp.65-73
  • Descrição: Inhalation of air pollution during transport is an important exposure pathway, especially for certain modes of travel and types of particles. We measured concentrations of particulate air pollution (particle number [PN], black carbon [BC], fine particles [PM ], particle size) using a mobile, bicycle-based monitoring platform during morning and afternoon rush-hour to explore patterns of exposure while cycling (34 days between August 14 and October 16, 2012 in Minneapolis, MN). Measurements were geo-located at 1 ​s intervals along 3 prescribed monitoring routes totaling 85 h (1426 km) of monitoring. Mean morning [afternoon] on-road concentrations were 32,500 [16,600] pt cm , 2.5 [0.7] μg m BC, 8.7 [8.3] μg m PM , and 42 [39] nm particle diameter. Concentrations were correlated with street functional class and declined within small distances from a major road (e.g., for PN and BC, mean concentration decreased ∼20% by moving 1 block away from major roads to adjacent local roads). We estimate the share of on-bicycle exposure attributable to near-traffic emissions (vs. regional pollution) is ∼50% for PN and BC; ∼25% for PM . Regression models of instantaneous traffic volumes, derived from on-bicycle video recordings of nearby traffic, quantify the increase in particle-concentrations associated with each passing vehicle; for example, trucks were associated with acute, high concentration exposure events (average concentration-increase per truck: 31,000 pt cm , 1.0 μg m PM , 1.6 μg m BC). Our findings could be used to inform design of low-exposure bicycle networks in urban areas.
  • Idioma: Inglês

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