VOCs Emission，Pollution and Control Measures

VOCs can not only bring harm to human health and environment, but also lead to photochemical reaction with NO_x under ultraviolet irradiation, which can generate some secondary pollutants such as O₃, etc. Furthermore, VOCs can also act with PM in the air to generate secondary organic aerosols. Therefore, the control over VOCs carries great significance. VOCs emission from natural sources was far higher than that from anthropogenic sources all over the world. In most parts of mainland of China, emission from the natural sources and anthropogenic sources was closer to each other. However, anthropogenic sources emission was higher than natural sources emission in some industrial intensive areas. The common VOCs control methods were summarized, including combustion, adsorption, absorption, condensation, biological membrane process, corona discharge, and photocatalytic oxidation method, etc. VOCs control was still at initial stage in China, and the stricter emission standards and ordinances were gradually shaping and improving as a result of technological advance and innovations.