Particle and Aerosol Research Vol. 2, No. 3, 4, December 2006 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Effect of diesel exhaust on the photochemical reactions of ambient air
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Abstracts
The effect of diesel exhaust on the formation of ozone and secondary aerosols during the photochemical
reactions of particle-filtered ambient air was investigated by captive-air irradiation experiments in four reaction
bags. Two bags were filled with the particle-filtered ambient air. The third bag was filled with diesel exhaust
diluted with particle-filtered ambient air, and the fourth bag was filled with particle-filtered diesel exhaust. The
diesel exhaust was injected using a two-stage dilution tunnel under the idling condition of a diesel vehicle. During
the photochemical reactions, the ozone production rate for particle-filtered ambient air ranged from 0.04 to 0.27
ppb min-1. The number and mass concentrations of newly formed particles increased up to 12,000 particles cm-3
and 1.2 ¥ìg m-3, respectively, in bags filled with particle-filtered ambient air. The ozone production rate and the
particle formation of filtered or non-filtered diesel exhaust diluted with particle-filtered ambient air were significantly
lower than those of particle-filtered ambient air for the same experiment due to higher NOx concentration. It
was observed that the pre-existing diesel particles suppressed the formation of new particles, however, they did not
make a significant difference in particle mass concentration under these experimental conditions. The ozone
production rate was found to be highly correlated with the concentration ratio of major volatile organic compounds
to NOx, and parti
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