The engine emits harmful gases such as nitrogen oxides, hydrocarbons and carbon monoxide. What does it mean in Chinese?

Nitrogen oxide compound is a kind of nitrogen oxide compound, including NO (nitric oxide) and NO2 (nitrogen dioxide). HC stands for hydrocarbons in harmful exhaust gas from automobile exhaust. CO is short for carbon monoxide.

NO itself is harmless. A small amount of NO can dilate blood vessels and enhance memory, but it can easily react with oxygen to produce nitrogen dioxide, which is toxic and irritating, damaging human respiratory tract and causing various diseases. It will pollute water, soil and atmosphere. Carbon monoxide is toxic. If inhaled, red blood cells will lose their oxygen-carrying ability, leading to suffocation and death of patients. This substance can be produced by burning gasoline, diesel oil and coal.

Extended data:

Unqualified exhaust gas is generally related to the three-way catalytic converter, so many vehicles will suggest cleaning the three-way catalytic converter after their emissions slightly exceed the standard. The function of three-way catalytic converter is environmental protection. Simply put, it can convert harmful gases discharged from the engine combustion chamber, such as carbon monoxide, hydrocarbons and nitrogen oxides, into harmless carbon dioxide, H2O and N2, namely carbon dioxide, water and nitrogen.

Xinhuanet-Ministry of Ecology and Environment: Motor vehicle pollution has become an important source of air pollution in China