What are the methods for detecting vehicle exhaust?

[SabrinaMarie]

Vehicle exhaust detection methods include single idle speed method, double idle speed method, steady-state working condition detection method, and simple transient working condition method. The following are specific introductions to the hazards of vehicle exhaust: 1. Formation of photochemical smog: Hydrocarbons and nitrogen oxides in vehicle exhaust undergo chemical reactions under sunlight to produce ozone, which combines with other components in the atmosphere to form photochemical smog. Its health hazards mainly manifest as eye irritation, causing pink eye; irritation of the nose, throat, trachea, and lungs, leading to chronic respiratory diseases. Photochemical smog can cause trees to wither and crops to significantly reduce yields; it can also reduce atmospheric visibility and hinder traffic. 2. Causing asphyxiation: Carbon monoxide has the highest content in vehicle exhaust. It can enter the alveoli through the respiratory tract, be absorbed by the blood, and combine with hemoglobin to form carboxyhemoglobin, reducing the blood's oxygen-carrying capacity and weakening the blood's oxygen supply to human tissues, leading to tissue hypoxia, which can cause symptoms such as headaches, and in severe cases, death by asphyxiation.