  Accurate characterization of the asymmetry parameter g is of crucial
importance for many radiative transfer and climate models. Here, we present our
portable light scattering (PLS) device which is designed for in situ,
real-time, and contact-free measurements of the particles phase function with
an integration time less than 1 second. With the PLS device, we have
characterized carbonaceous aerosols, such as smoldering products from Alaskan
peat, soot from a kerosene lamp and non-carbonaceous aerosols such as Arizona
Road Dust. We found the g to be 0.664+/-0.002, 0.506+/-0.004, and 0.701+/-0.020
for those three kinds of particles, respectively. Compare to commercial
nephelometers, our PLS device has reduced error in g due to angular truncation.
