Abstract
In Japan 8 years have passed since photo-chemical smog began to appear, but its causes are still not clearly known. As a preventive measure for such photo-chemical smog, it seems necessary to prevent discharge of hydrocarbons and NOχ which are regarded as the major causes to form photo-chemical oxidant. Among the two causes, hydrocarbons from automobiles and NOχ have been already regulated, but a regulation of hydrocarbon emission from stationary sources has not been enforced except for few local autonomies. According to the investigation by Environmental Agency of Japan, in 1973, about 1.3 million tons of hydrocarbons were emitted from stationary sources, in which the petroleum industry emitted about 0.2 million tons, that is, 15% of total discharge.In this reviews I referred the state of hydrocarbon emission and its preventive measure in petroleum industry including refinery plants, oil terminals and gas stations.
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