When it is necessary to check whether or not odorous substances are emitted, 22 odorous substances determined by the Ministry of the Environment shall be measured by instrumental analysis and the examinations should pass the regulation standards. Samples of designated odorous substances are collected at the workplace site boundary.
It is a method to measure complex odor caused by two or more odor substances. It calculates the dilution rate of the sample by applying air dilution sensory method.
Even at low concentrations, substances can be directly or indirectly harmful to human health or the growth of plants and animals through long-term exposure; these substances are deemed necessary for management in atmospheric emissions and are set by the Ordinance of the Ministry of Environment.