Ozone is a typical secondary pollutant. The ozone in the ambient air is mainly produced by photochemical reactions. A large amount of nitrogen oxides and volatile organic compounds (VOCs) emitted by human social activities pass through the photochemistry. The effect is to produce ozone. The reason why ozone pollution is difficult to control is mainly due to the following three factors: First, the ozone has a long life span and can be transported over long distances to form regional pollution. Second, the chemical generation mechanism of ozone is complex, and ozone precursors are reduced. Emissions must conform to a certain scientific ratio and be adapted to local conditions. Third, the precursors of ozone VOCs are complex, diverse, and highly variable, making precision control difficult.