Particle and Aerosol Research Vol. 2, No. 2, June 2006 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Effect of relative humidity on the growth of atmospheric aerosols in winter
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Abstracts
The effect of relative humidity on the growth of atmospheric aerosols was investigated using a 5.8-m3 indoor
smog chamber in winter. The relative humidity of the chamber filled with ambient air was increased from below
20% to 36~91% by addition of water vapor. The particle size distribution and the concentrations of O3, NO, and
NO2 were measured during the experiment. The concentrations of O3, NO, and NO2 rapidly decreased and the
number concentration of particles rapidly increased during the addition of water vapor. Thereafter the gases
concentrations slightly changed under dark condition, however the particle growth greatly depended on the initial
ambient air quality. It was concluded that the water vapor highly contributed to the particle growth under the air
quality conditions of high O3 and low NOx concentrations, and low concentration of dry particles.
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