The RSS production is about 40-50 tons per cooperative during the peak season while for each ton of RSS, about 1.2-1.5 ton of fuel-wood is consumed. Each cooperative does not have any pollution control devices and the smoke is released into the factory workplace area through the ventilating lids on the roof of drying room which is directly opened to the inside of factory building. Therefore the air pollution in the workplace by smoke may be under serious situation.