A smog chamber was used for experiments to model
the secondary organic aerosol (SOA) formation
in the atmosphere. In the irradiation experiments
of the toluene-NOx-humid air system,
SOA was produced after NO was sufficiently consumed.
The maximum SOA yield was 6.6% which increased
when a higher concentration of SOA was produced.
The relationship between yield and concentration
was explained by a gas/particle partition model
of the semi-volatile products. SOA yields obtained
in this study were half those of Odum et al. The
influence on SOA yield by some factors except
for SOA concentration was discussed.
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